diff --git a/src/addon/mod/choice/components/index/index.ts b/src/addon/mod/choice/components/index/index.ts
index fe583dd04..fb2243153 100644
--- a/src/addon/mod/choice/components/index/index.ts
+++ b/src/addon/mod/choice/components/index/index.ts
@@ -352,14 +352,13 @@ export class AddonModChoiceIndexComponent extends CoreCourseModuleMainActivityCo
             }
 
             const modal = this.domUtils.showModalLoading('core.sending', true);
-            this.choiceProvider.submitResponse(this.choice.id, this.choice.name, this.courseId, responses).then(() => {
+            this.choiceProvider.submitResponse(this.choice.id, this.choice.name, this.courseId, responses).then((online) => {
                 // Success!
                 // Check completion since it could be configured to complete once the user answers the choice.
                 this.courseProvider.checkModuleCompletion(this.courseId, this.module.completiondata);
                 this.domUtils.scrollToTop(this.content);
 
-                // Let's refresh the data.
-                return this.refreshContent(false);
+                return this.dataUpdated(online);
             }).catch((message) => {
                 this.domUtils.showErrorModalDefault(message, 'addon.mod_choice.cannotsubmit', true);
             }).finally(() => {
@@ -377,7 +376,7 @@ export class AddonModChoiceIndexComponent extends CoreCourseModuleMainActivityCo
             this.choiceProvider.deleteResponses(this.choice.id, this.choice.name, this.courseId).then(() => {
                 this.domUtils.scrollToTop(this.content);
 
-                // Success! Let's refresh the data.
+                // Refresh the data. Don't call dataUpdated because deleting an answer doesn't mark the choice as outdated.
                 return this.refreshContent(false);
             }).catch((message) => {
                 this.domUtils.showErrorModalDefault(message, 'addon.mod_choice.cannotsubmit', true);
@@ -389,6 +388,28 @@ export class AddonModChoiceIndexComponent extends CoreCourseModuleMainActivityCo
         });
     }
 
+    /**
+     * Function to call when some data has changed. It will refresh/prefetch data.
+     *
+     * @param {boolean} online Whether the data was sent to server or stored in offline.
+     * @return {Promise<any>} Promise resolved when done.
+     */
+    protected dataUpdated(online: boolean): Promise<any> {
+        if (online && this.isPrefetched()) {
+            // The choice is downloaded, update the data.
+            return this.choiceSync.prefetchAfterUpdate(this.module, this.courseId).then(() => {
+                // Update the view.
+                this.showLoadingAndFetch(false, false);
+            }).catch(() => {
+                // Prefetch failed, refresh the data.
+                return this.refreshContent(false);
+            });
+        } else {
+            // Not downloaded, refresh the data.
+            return this.refreshContent(false);
+        }
+    }
+
     /**
      * Performs the sync of the activity.
      *
diff --git a/src/addon/mod/choice/providers/choice.ts b/src/addon/mod/choice/providers/choice.ts
index 8845aed49..b94e92b9c 100644
--- a/src/addon/mod/choice/providers/choice.ts
+++ b/src/addon/mod/choice/providers/choice.ts
@@ -19,6 +19,7 @@ import { CoreAppProvider } from '@providers/app';
 import { CoreFilepoolProvider } from '@providers/filepool';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
 import { AddonModChoiceOfflineProvider } from './offline';
+import { CoreSiteWSPreSets } from '@classes/site';
 
 /**
  * Service that provides some features for choices.
@@ -68,9 +69,9 @@ export class AddonModChoiceProvider {
      * @param  {number}   courseId    Course ID the choice belongs to.
      * @param  {number[]} [responses] IDs of the answers. If not defined, delete all the answers of the current user.
      * @param  {string}   [siteId]    Site ID. If not defined, current site.
-     * @return {Promise<any>} Promise resolved when the options are deleted.
+     * @return {Promise<boolean>} Promise resolved with boolean: true if response was sent to server, false if stored in device.
      */
-    deleteResponses(choiceId: number, name: string, courseId: number, responses?: number[], siteId?: string): Promise<any> {
+    deleteResponses(choiceId: number, name: string, courseId: number, responses?: number[], siteId?: string): Promise<boolean> {
         siteId = siteId || this.sitesProvider.getCurrentSiteId();
         responses = responses || [];
 
@@ -173,20 +174,29 @@ export class AddonModChoiceProvider {
      * @param  {number}  courseId           Course ID.
      * @param  {string}  key                Name of the property to check.
      * @param  {any}     value              Value to search.
-     * @param  {boolean} [forceCache=false] True to always get the value from cache, false otherwise. Default false.
+     * @param  {boolean} [forceCache] True to always get the value from cache, false otherwise. Default false.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @return {Promise<any>} Promise resolved when the choice is retrieved.
      */
-    protected getChoiceByDataKey(siteId: string, courseId: number, key: string, value: any, forceCache: boolean = false)
-            : Promise<any> {
+    protected getChoiceByDataKey(siteId: string, courseId: number, key: string, value: any, forceCache?: boolean,
+            ignoreCache?: boolean): Promise<any> {
+
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                 courseids: [courseId]
             };
-            const preSets = {
+            const preSets: CoreSiteWSPreSets = {
                 cacheKey: this.getChoiceDataCacheKey(courseId),
                 omitExpires: forceCache
             };
 
+            if (forceCache) {
+                preSets.omitExpires = true;
+            } else if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
+            }
+
             return site.read('mod_choice_get_choices_by_courses', params, preSets).then((response) => {
                 if (response && response.choices) {
                     const currentChoice = response.choices.find((choice) => choice[key] == value);
@@ -206,11 +216,12 @@ export class AddonModChoiceProvider {
      * @param  {number}  courseId           Course ID.
      * @param  {number}  cmId               Course module ID.
      * @param  {string}  [siteId]           Site ID. If not defined, current site.
-     * @param  {boolean} [forceCache=false] True to always get the value from cache, false otherwise. Default false.
+     * @param  {boolean} [forceCache] True to always get the value from cache, false otherwise. Default false.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @return {Promise<any>} Promise resolved when the choice is retrieved.
      */
-    getChoice(courseId: number, cmId: number, siteId?: string, forceCache: boolean = false): Promise<any> {
-        return this.getChoiceByDataKey(siteId, courseId, 'coursemodule', cmId, forceCache);
+    getChoice(courseId: number, cmId: number, siteId?: string, forceCache?: boolean, ignoreCache?: boolean): Promise<any> {
+        return this.getChoiceByDataKey(siteId, courseId, 'coursemodule', cmId, forceCache, ignoreCache);
     }
 
     /**
@@ -219,29 +230,36 @@ export class AddonModChoiceProvider {
      * @param  {number}  courseId           Course ID.
      * @param  {number}  choiceId           Choice ID.
      * @param  {string}  [siteId]           Site ID. If not defined, current site.
-     * @param  {boolean} [forceCache=false] True to always get the value from cache, false otherwise. Default false.
+     * @param  {boolean} [forceCache] True to always get the value from cache, false otherwise. Default false.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @return {Promise<any>} Promise resolved when the choice is retrieved.
      */
-    getChoiceById(courseId: number, choiceId: number, siteId?: string, forceCache: boolean = false): Promise<any> {
-        return this.getChoiceByDataKey(siteId, courseId, 'id', choiceId, forceCache);
+    getChoiceById(courseId: number, choiceId: number, siteId?: string, forceCache?: boolean, ignoreCache?: boolean): Promise<any> {
+        return this.getChoiceByDataKey(siteId, courseId, 'id', choiceId, forceCache, ignoreCache);
     }
 
     /**
      * Get choice options.
      *
-     * @param  {number} choiceId Choice ID.
-     * @param  {string} [siteId] Site ID. If not defined, current site.
+     * @param {number} choiceId Choice ID.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
+     * @param {string} [siteId] Site ID. If not defined, current site.
      * @return {Promise<any>} Promise resolved with choice options.
      */
-    getOptions(choiceId: number, siteId?: string): Promise<any> {
+    getOptions(choiceId: number, ignoreCache?: boolean, siteId?: string): Promise<any> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                 choiceid: choiceId
             };
-            const preSets = {
+            const preSets: CoreSiteWSPreSets = {
                 cacheKey: this.getChoiceOptionsCacheKey(choiceId)
             };
 
+            if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
+            }
+
             return site.read('mod_choice_get_choice_options', params, preSets).then((response) => {
                 if (response.options) {
                     return response.options;
@@ -255,19 +273,25 @@ export class AddonModChoiceProvider {
     /**
      * Get choice results.
      *
-     * @param  {number} choiceId Choice ID.
-     * @param  {string} [siteId] Site ID. If not defined, current site.
+     * @param {number} choiceId Choice ID.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
+     * @param {string} [siteId] Site ID. If not defined, current site.
      * @return {Promise<any>} Promise resolved with choice results.
      */
-    getResults(choiceId: number, siteId?: string): Promise<any> {
+    getResults(choiceId: number, ignoreCache?: boolean, siteId?: string): Promise<any> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                 choiceid: choiceId
             };
-            const preSets = {
+            const preSets: CoreSiteWSPreSets = {
                 cacheKey: this.getChoiceResultsCacheKey(choiceId)
             };
 
+            if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
+            }
+
             return site.read('mod_choice_get_choice_results', params, preSets).then((response) => {
                 if (response.options) {
                     return response.options;
diff --git a/src/addon/mod/choice/providers/prefetch-handler.ts b/src/addon/mod/choice/providers/prefetch-handler.ts
index fb3680e4c..0b2f74eba 100644
--- a/src/addon/mod/choice/providers/prefetch-handler.ts
+++ b/src/addon/mod/choice/providers/prefetch-handler.ts
@@ -23,7 +23,6 @@ import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseActivityPrefetchHandlerBase } from '@core/course/classes/activity-prefetch-handler';
 import { CoreUserProvider } from '@core/user/providers/user';
 import { AddonModChoiceProvider } from './choice';
-import { AddonModChoiceSyncProvider } from './sync';
 
 /**
  * Handler to prefetch choices.
@@ -38,7 +37,7 @@ export class AddonModChoicePrefetchHandler extends CoreCourseActivityPrefetchHan
     constructor(translate: TranslateService, appProvider: CoreAppProvider, utils: CoreUtilsProvider,
             courseProvider: CoreCourseProvider, filepoolProvider: CoreFilepoolProvider, sitesProvider: CoreSitesProvider,
             domUtils: CoreDomUtilsProvider, protected choiceProvider: AddonModChoiceProvider,
-            protected syncProvider: AddonModChoiceSyncProvider, protected userProvider: CoreUserProvider) {
+            protected userProvider: CoreUserProvider) {
 
         super(translate, appProvider, utils, courseProvider, filepoolProvider, sitesProvider, domUtils);
     }
@@ -66,12 +65,12 @@ export class AddonModChoicePrefetchHandler extends CoreCourseActivityPrefetchHan
      * @return {Promise<any>} Promise resolved when done.
      */
     protected prefetchChoice(module: any, courseId: number, single: boolean, siteId: string): Promise<any> {
-        return this.choiceProvider.getChoice(courseId, module.id, siteId).then((choice) => {
+        return this.choiceProvider.getChoice(courseId, module.id, siteId, false, true).then((choice) => {
             const promises = [];
 
             // Get the options and results.
-            promises.push(this.choiceProvider.getOptions(choice.id, siteId));
-            promises.push(this.choiceProvider.getResults(choice.id, siteId).then((options) => {
+            promises.push(this.choiceProvider.getOptions(choice.id, true, siteId));
+            promises.push(this.choiceProvider.getResults(choice.id, true, siteId).then((options) => {
                 // If we can see the users that answered, prefetch their profile and avatar.
                 const subPromises = [];
                 options.forEach((option) => {
diff --git a/src/addon/mod/choice/providers/sync.ts b/src/addon/mod/choice/providers/sync.ts
index be612049a..606ffc385 100644
--- a/src/addon/mod/choice/providers/sync.ts
+++ b/src/addon/mod/choice/providers/sync.ts
@@ -14,7 +14,6 @@
 
 import { Injectable } from '@angular/core';
 import { CoreLoggerProvider } from '@providers/logger';
-import { CoreSyncBaseProvider } from '@classes/base-sync';
 import { CoreSitesProvider } from '@providers/sites';
 import { CoreAppProvider } from '@providers/app';
 import { CoreUtilsProvider } from '@providers/utils/utils';
@@ -26,13 +25,16 @@ import { CoreEventsProvider } from '@providers/events';
 import { TranslateService } from '@ngx-translate/core';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
+import { CoreCourseModulePrefetchDelegate } from '@core/course/providers/module-prefetch-delegate';
+import { CoreCourseActivitySyncBaseProvider } from '@core/course/classes/activity-sync';
 import { CoreSyncProvider } from '@providers/sync';
+import { AddonModChoicePrefetchHandler } from './prefetch-handler';
 
 /**
  * Service to sync choices.
  */
 @Injectable()
-export class AddonModChoiceSyncProvider extends CoreSyncBaseProvider {
+export class AddonModChoiceSyncProvider extends CoreCourseActivitySyncBaseProvider {
 
     static AUTO_SYNCED = 'addon_mod_choice_autom_synced';
     protected componentTranslate: string;
@@ -42,9 +44,11 @@ export class AddonModChoiceSyncProvider extends CoreSyncBaseProvider {
             private eventsProvider: CoreEventsProvider,  private choiceProvider: AddonModChoiceProvider,
             translate: TranslateService, private utils: CoreUtilsProvider, protected textUtils: CoreTextUtilsProvider,
             courseProvider: CoreCourseProvider, syncProvider: CoreSyncProvider, timeUtils: CoreTimeUtilsProvider,
-            private logHelper: CoreCourseLogHelperProvider) {
+            private logHelper: CoreCourseLogHelperProvider, prefetchHandler: AddonModChoicePrefetchHandler,
+            prefetchDelegate: CoreCourseModulePrefetchDelegate) {
+
         super('AddonModChoiceSyncProvider', loggerProvider, sitesProvider, appProvider, syncProvider, textUtils, translate,
-                timeUtils);
+                timeUtils, prefetchDelegate, prefetchHandler);
 
         this.componentTranslate = courseProvider.translateModuleName('choice');
     }
@@ -195,16 +199,8 @@ export class AddonModChoiceSyncProvider extends CoreSyncBaseProvider {
             });
         }).then(() => {
             if (courseId) {
-                const promises = [
-                    this.choiceProvider.invalidateChoiceData(courseId),
-                    choiceId ? this.choiceProvider.invalidateOptions(choiceId) : Promise.resolve(),
-                    choiceId ? this.choiceProvider.invalidateResults(choiceId) : Promise.resolve(),
-                ];
-
-                // Data has been sent to server, update choice data.
-                return Promise.all(promises).then(() => {
-                    return this.choiceProvider.getChoiceById(courseId, choiceId, siteId);
-                }).catch(() => {
+                // Data has been sent to server, prefetch choice if needed.
+                return this.prefetchAfterUpdate(module, courseId, undefined, siteId).catch(() => {
                     // Ignore errors.
                 });
             }
diff --git a/src/addon/mod/feedback/components/index/index.ts b/src/addon/mod/feedback/components/index/index.ts
index 6914e4b03..76610926d 100644
--- a/src/addon/mod/feedback/components/index/index.ts
+++ b/src/addon/mod/feedback/components/index/index.ts
@@ -77,15 +77,29 @@ export class AddonModFeedbackIndexComponent extends CoreCourseModuleMainActivity
         // Listen for form submit events.
         this.submitObserver = this.eventsProvider.on(AddonModFeedbackProvider.FORM_SUBMITTED, (data) => {
             if (this.feedback && data.feedbackId == this.feedback.id) {
-                // Go to review attempt if an attempt in this quiz was finished and synced.
                 this.tabsLoaded['analysis'] = false;
                 this.tabsLoaded['overview'] = false;
                 this.loaded = false;
-                if (data.tab != this.tab) {
-                    this.tabChanged(data.tab);
+
+                let promise;
+
+                // Prefetch data if needed.
+                if (!data.offline && this.isPrefetched()) {
+                    promise = this.feedbackSync.prefetchAfterUpdate(this.module, this.courseId).catch(() => {
+                        // Ignore errors.
+                    });
                 } else {
-                    this.loadContent(true);
+                    promise = Promise.resolve();
                 }
+
+                promise.then(() => {
+                    // Load the right tab.
+                    if (data.tab != this.tab) {
+                        this.tabChanged(data.tab);
+                    } else {
+                        this.loadContent(true);
+                    }
+                });
             }
         }, this.siteId);
     }
diff --git a/src/addon/mod/feedback/pages/form/form.ts b/src/addon/mod/feedback/pages/form/form.ts
index 214f12bd7..0d8bbf9fa 100644
--- a/src/addon/mod/feedback/pages/form/form.ts
+++ b/src/addon/mod/feedback/pages/form/form.ts
@@ -338,8 +338,13 @@ export class AddonModFeedbackFormPage implements OnDestroy {
     ngOnDestroy(): void {
         if (this.submitted) {
             const tab = this.submitted == 'analysis' ? 'analysis' : 'overview';
+
             // If form has been submitted, the info has been already invalidated but we should update index view.
-            this.eventsProvider.trigger(AddonModFeedbackProvider.FORM_SUBMITTED, {feedbackId: this.feedback.id, tab: tab});
+            this.eventsProvider.trigger(AddonModFeedbackProvider.FORM_SUBMITTED, {
+                feedbackId: this.feedback.id,
+                tab: tab,
+                offline: this.completedOffline
+            });
         }
         this.onlineObserver && this.onlineObserver.unsubscribe();
     }
diff --git a/src/addon/mod/feedback/providers/feedback.ts b/src/addon/mod/feedback/providers/feedback.ts
index a113791c5..7d3ebd4d9 100644
--- a/src/addon/mod/feedback/providers/feedback.ts
+++ b/src/addon/mod/feedback/providers/feedback.ts
@@ -20,6 +20,7 @@ import { CoreFilepoolProvider } from '@providers/filepool';
 import { CoreAppProvider } from '@providers/app';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
 import { AddonModFeedbackOfflineProvider } from './offline';
+import { CoreSiteWSPreSets } from '@classes/site';
 
 /**
  * Service that provides some features for feedbacks.
@@ -215,11 +216,14 @@ export class AddonModFeedbackProvider {
      *
      * @param   {number}    feedbackId      Feedback ID.
      * @param   {number}    groupId         Group id, 0 means that the function will determine the user group.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @param   {string}    [siteId]        Site ID. If not defined, current site.
      * @param   {any}       [previous]      Only for recurrent use. Object with the previous fetched info.
      * @return  {Promise<any>}              Promise resolved when the info is retrieved.
      */
-    getAllNonRespondents(feedbackId: number, groupId: number, siteId?: string, previous?: any): Promise<any> {
+    getAllNonRespondents(feedbackId: number, groupId: number, ignoreCache?: boolean, siteId?: string, previous?: any)
+            : Promise<any> {
+
         siteId = siteId || this.sitesProvider.getCurrentSiteId();
         if (typeof previous == 'undefined') {
             previous = {
@@ -228,7 +232,7 @@ export class AddonModFeedbackProvider {
             };
         }
 
-        return this.getNonRespondents(feedbackId, groupId, previous.page, siteId).then((response) => {
+        return this.getNonRespondents(feedbackId, groupId, previous.page, ignoreCache, siteId).then((response) => {
             if (previous.users.length < response.total) {
                 previous.users = previous.users.concat(response.users);
             }
@@ -237,7 +241,7 @@ export class AddonModFeedbackProvider {
                 // Can load more.
                 previous.page++;
 
-                return this.getAllNonRespondents(feedbackId, groupId, siteId, previous);
+                return this.getAllNonRespondents(feedbackId, groupId, ignoreCache, siteId, previous);
             }
             previous.total = response.total;
 
@@ -250,11 +254,14 @@ export class AddonModFeedbackProvider {
      *
      * @param   {number}    feedbackId      Feedback ID.
      * @param   {number}    groupId         Group id, 0 means that the function will determine the user group.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @param   {string}    [siteId]        Site ID. If not defined, current site.
      * @param   {any}       [previous]      Only for recurrent use. Object with the previous fetched info.
      * @return  {Promise<any>}              Promise resolved when the info is retrieved.
      */
-    getAllResponsesAnalysis(feedbackId: number, groupId: number, siteId?: string, previous?: any): Promise<any> {
+    getAllResponsesAnalysis(feedbackId: number, groupId: number, ignoreCache?: boolean, siteId?: string, previous?: any)
+            : Promise<any> {
+
         siteId = siteId || this.sitesProvider.getCurrentSiteId();
         if (typeof previous == 'undefined') {
             previous = {
@@ -264,7 +271,7 @@ export class AddonModFeedbackProvider {
             };
         }
 
-        return this.getResponsesAnalysis(feedbackId, groupId, previous.page, siteId).then((responses) => {
+        return this.getResponsesAnalysis(feedbackId, groupId, previous.page, ignoreCache, siteId).then((responses) => {
             if (previous.anonattempts.length < responses.totalanonattempts) {
                 previous.anonattempts = previous.anonattempts.concat(responses.anonattempts);
             }
@@ -277,7 +284,7 @@ export class AddonModFeedbackProvider {
                 // Can load more.
                 previous.page++;
 
-                return this.getAllResponsesAnalysis(feedbackId, groupId, siteId, previous);
+                return this.getAllResponsesAnalysis(feedbackId, groupId, ignoreCache, siteId, previous);
             }
 
             previous.totalattempts = responses.totalattempts;
@@ -292,15 +299,16 @@ export class AddonModFeedbackProvider {
      *
      * @param   {number}    feedbackId      Feedback ID.
      * @param   {number}    [groupId]       Group ID.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @param   {string}    [siteId]        Site ID. If not defined, current site.
      * @return  {Promise<any>}                   Promise resolved when the feedback is retrieved.
      */
-    getAnalysis(feedbackId: number, groupId?: number, siteId?: string): Promise<any> {
+    getAnalysis(feedbackId: number, groupId?: number, ignoreCache?: boolean, siteId?: string): Promise<any> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     feedbackid: feedbackId
                 },
-                preSets = {
+                preSets: CoreSiteWSPreSets = {
                     cacheKey: this.getAnalysisDataCacheKey(feedbackId, groupId)
                 };
 
@@ -308,6 +316,11 @@ export class AddonModFeedbackProvider {
                 params['groupid'] = groupId;
             }
 
+            if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
+            }
+
             return site.read('mod_feedback_get_analysis', params, preSets);
         });
     }
@@ -338,11 +351,12 @@ export class AddonModFeedbackProvider {
      *
      * @param   {number}    feedbackId      Feedback ID.
      * @param   {number}    attemptId       Attempt id to find.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @param   {string}    [siteId]        Site ID. If not defined, current site.
      * @param   {any}       [previous]      Only for recurrent use. Object with the previous fetched info.
      * @return  {Promise<any>}              Promise resolved when the info is retrieved.
      */
-    getAttempt(feedbackId: number, attemptId: number, siteId?: string, previous?: any): Promise<any> {
+    getAttempt(feedbackId: number, attemptId: number, ignoreCache?: boolean, siteId?: string, previous?: any): Promise<any> {
         siteId = siteId || this.sitesProvider.getCurrentSiteId();
         if (typeof previous == 'undefined') {
             previous = {
@@ -352,7 +366,7 @@ export class AddonModFeedbackProvider {
             };
         }
 
-        return this.getResponsesAnalysis(feedbackId, 0, previous.page, siteId).then((responses) => {
+        return this.getResponsesAnalysis(feedbackId, 0, previous.page, ignoreCache, siteId).then((responses) => {
             let attempt;
 
             attempt = responses.attempts.find((attempt) => {
@@ -383,7 +397,7 @@ export class AddonModFeedbackProvider {
                 // Can load more. Check there.
                 previous.page++;
 
-                return this.getAttempt(feedbackId, attemptId, siteId, previous);
+                return this.getAttempt(feedbackId, attemptId, ignoreCache, siteId, previous);
             }
 
             // Not found and all loaded. Reject.
@@ -405,18 +419,24 @@ export class AddonModFeedbackProvider {
      * Returns the temporary completion timemodified for the current user.
      *
      * @param   {number}    feedbackId      Feedback ID.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @param   {string}    [siteId]        Site ID. If not defined, current site.
      * @return  {Promise<any>}                   Promise resolved when the info is retrieved.
      */
-    getCurrentCompletedTimeModified(feedbackId: number, siteId?: string): Promise<any> {
+    getCurrentCompletedTimeModified(feedbackId: number, ignoreCache?: boolean, siteId?: string): Promise<any> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     feedbackid: feedbackId
                 },
-                preSets = {
+                preSets: CoreSiteWSPreSets = {
                     cacheKey: this.getCurrentCompletedTimeModifiedDataCacheKey(feedbackId)
                 };
 
+            if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
+            }
+
             return site.read('mod_feedback_get_current_completed_tmp', params, preSets).then((response) => {
                 if (response && typeof response.feedback != 'undefined' && typeof response.feedback.timemodified != 'undefined') {
                     return response.feedback.timemodified;
@@ -552,20 +572,26 @@ export class AddonModFeedbackProvider {
      * @param {string}   key                 Name of the property to check.
      * @param {any}      value               Value to search.
      * @param {string}   [siteId]            Site ID. If not defined, current site.
-     * @param  {boolean} [forceCache=false]  True to always get the value from cache, false otherwise. Default false.
+     * @param {boolean} [forceCache]  True to always get the value from cache, false otherwise. Default false.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @return {Promise<any>}  Promise resolved when the feedback is retrieved.
      */
-    protected getFeedbackDataByKey(courseId: number, key: string, value: any, siteId?: string, forceCache?: boolean): Promise<any> {
+    protected getFeedbackDataByKey(courseId: number, key: string, value: any, siteId?: string, forceCache?: boolean,
+            ignoreCache?: boolean): Promise<any> {
+
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     courseids: [courseId]
                 },
-                preSets = {
+                preSets: CoreSiteWSPreSets = {
                     cacheKey: this.getFeedbackCacheKey(courseId)
                 };
 
             if (forceCache) {
-                preSets['omitExpires'] = true;
+                preSets.omitExpires = true;
+            } else if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
             }
 
             return site.read('mod_feedback_get_feedbacks_by_courses', params, preSets).then((response) => {
@@ -589,11 +615,12 @@ export class AddonModFeedbackProvider {
      * @param {number}   courseId       Course ID.
      * @param {number}   cmId           Course module ID.
      * @param {string}   [siteId]       Site ID. If not defined, current site.
-     * @param  {boolean} [forceCache]   True to always get the value from cache, false otherwise. Default false.
+     * @param {boolean} [forceCache]   True to always get the value from cache, false otherwise. Default false.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @return {Promise<any>}   Promise resolved when the feedback is retrieved.
      */
-    getFeedback(courseId: number, cmId: number, siteId?: string, forceCache?: boolean): Promise<any> {
-        return this.getFeedbackDataByKey(courseId, 'coursemodule', cmId, siteId, forceCache);
+    getFeedback(courseId: number, cmId: number, siteId?: string, forceCache?: boolean, ignoreCache?: boolean): Promise<any> {
+        return this.getFeedbackDataByKey(courseId, 'coursemodule', cmId, siteId, forceCache, ignoreCache);
     }
 
     /**
@@ -603,28 +630,35 @@ export class AddonModFeedbackProvider {
      * @param {number}  id            Feedback ID.
      * @param {string}  [siteId]      Site ID. If not defined, current site.
      * @param {boolean} [forceCache]  True to always get the value from cache, false otherwise. Default false.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @return {Promise<any>}         Promise resolved when the feedback is retrieved.
      */
-    getFeedbackById(courseId: number, id: number, siteId?: string, forceCache?: boolean): Promise<any> {
-        return this.getFeedbackDataByKey(courseId, 'id', id, siteId, forceCache);
+    getFeedbackById(courseId: number, id: number, siteId?: string, forceCache?: boolean, ignoreCache?: boolean): Promise<any> {
+        return this.getFeedbackDataByKey(courseId, 'id', id, siteId, forceCache, ignoreCache);
     }
 
     /**
      * Returns the items (questions) in the given feedback.
      *
      * @param   {number}    feedbackId      Feedback ID.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @param   {string}    [siteId]        Site ID. If not defined, current site.
      * @return  {Promise<any>}                   Promise resolved when the info is retrieved.
      */
-    getItems(feedbackId: number, siteId?: string): Promise<any> {
+    getItems(feedbackId: number, ignoreCache?: boolean, siteId?: string): Promise<any> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     feedbackid: feedbackId
                 },
-                preSets = {
+                preSets: CoreSiteWSPreSets = {
                     cacheKey: this.getItemsDataCacheKey(feedbackId)
                 };
 
+            if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
+            }
+
             return site.read('mod_feedback_get_items', params, preSets);
         });
     }
@@ -645,20 +679,28 @@ export class AddonModFeedbackProvider {
      * @param   {number}    feedbackId      Feedback ID.
      * @param   {number}    [groupId=0]     Group id, 0 means that the function will determine the user group.
      * @param   {number}    [page=0]        The page of records to return.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @param   {string}    [siteId]        Site ID. If not defined, current site.
      * @return  {Promise<any>}              Promise resolved when the info is retrieved.
      */
-    getNonRespondents(feedbackId: number, groupId: number = 0, page: number = 0, siteId?: string): Promise<any> {
+    getNonRespondents(feedbackId: number, groupId: number = 0, page: number = 0, ignoreCache?: boolean, siteId?: string)
+            : Promise<any> {
+
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     feedbackid: feedbackId,
                     groupid: groupId,
                     page: page
                 },
-                preSets = {
+                preSets: CoreSiteWSPreSets = {
                     cacheKey: this.getNonRespondentsDataCacheKey(feedbackId, groupId)
                 };
 
+            if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
+            }
+
             return site.read('mod_feedback_get_non_respondents', params, preSets);
         });
     }
@@ -725,7 +767,7 @@ export class AddonModFeedbackProvider {
             });
         }).catch(() => {
             // If getPageItems fail we should calculate it using getItems.
-            return this.getItems(feedbackId, siteId).then((response) => {
+            return this.getItems(feedbackId, false, siteId).then((response) => {
                 return this.fillValues(feedbackId, response.items, offline, ignoreCache, siteId).then((items) => {
                     // Separate items by pages.
                     let currentPage = 0;
@@ -802,20 +844,26 @@ export class AddonModFeedbackProvider {
      * @param   {number}    feedbackId      Feedback ID.
      * @param   {number}    groupId         Group id, 0 means that the function will determine the user group.
      * @param   {number}    page            The page of records to return.
+     * @param   {boolean} [ignoreCache=false] True if it should ignore cached data (it will always fail in offline or server down).
      * @param   {string}    [siteId]        Site ID. If not defined, current site.
      * @return  {Promise<any>}              Promise resolved when the info is retrieved.
      */
-    getResponsesAnalysis(feedbackId: number, groupId: number, page: number, siteId?: string): Promise<any> {
+    getResponsesAnalysis(feedbackId: number, groupId: number, page: number, ignoreCache?: boolean, siteId?: string): Promise<any> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     feedbackid: feedbackId,
                     groupid: groupId || 0,
                     page: page || 0
                 },
-                preSets = {
+                preSets: CoreSiteWSPreSets = {
                     cacheKey: this.getResponsesAnalysisDataCacheKey(feedbackId, groupId)
                 };
 
+            if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
+            }
+
             return site.read('mod_feedback_get_responses_analysis', params, preSets);
         });
     }
@@ -1037,18 +1085,24 @@ export class AddonModFeedbackProvider {
      * Returns if feedback has been completed
      *
      * @param   {number}    feedbackId      Feedback ID.
+     * @param   {boolean} [ignoreCache=false] True if it should ignore cached data (it will always fail in offline or server down).
      * @param   {string}    [siteId]        Site ID. If not defined, current site.
      * @return  {Promise<boolean>}              Promise resolved when the info is retrieved.
      */
-    isCompleted(feedbackId: number, siteId?: string): Promise<boolean> {
+    isCompleted(feedbackId: number, ignoreCache?: boolean, siteId?: string): Promise<boolean> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     feedbackid: feedbackId
                 },
-                preSets = {
+                preSets: CoreSiteWSPreSets = {
                     cacheKey: this.getCompletedDataCacheKey(feedbackId)
                 };
 
+            if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
+            }
+
             return this.utils.promiseWorks(site.read('mod_feedback_get_last_completed', params, preSets));
         });
     }
diff --git a/src/addon/mod/feedback/providers/prefetch-handler.ts b/src/addon/mod/feedback/providers/prefetch-handler.ts
index 73a9dfc6b..ab9528fc7 100644
--- a/src/addon/mod/feedback/providers/prefetch-handler.ts
+++ b/src/addon/mod/feedback/providers/prefetch-handler.ts
@@ -173,19 +173,15 @@ export class AddonModFeedbackPrefetchHandler extends CoreCourseActivityPrefetchH
      */
     protected prefetchFeedback(module: any, courseId: number, single: boolean, siteId: string): Promise<any> {
         // Prefetch the feedback data.
-        return this.feedbackProvider.getFeedback(courseId, module.id).then((feedback) => {
-            const p1 = [];
+        return this.feedbackProvider.getFeedback(courseId, module.id, siteId, false, true).then((feedback) => {
+            let files = (feedback.pageaftersubmitfiles || []).concat(this.getIntroFilesFromInstance(module, feedback));
 
-            p1.push(this.getFiles(module, courseId).then((files) => {
-                return this.filepoolProvider.addFilesToQueue(siteId, files, this.component, module.id);
-            }));
-
-            p1.push(this.feedbackProvider.getFeedbackAccessInformation(feedback.id, false, true, siteId).then((accessData) => {
+            return this.feedbackProvider.getFeedbackAccessInformation(feedback.id, false, true, siteId).then((accessData) => {
                 const p2 = [];
                 if (accessData.canedititems || accessData.canviewreports) {
                     // Get all groups analysis.
-                    p2.push(this.feedbackProvider.getAnalysis(feedback.id, undefined, siteId));
-                    p2.push(this.groupsProvider.getActivityGroupInfo(feedback.coursemodule, true, undefined, siteId)
+                    p2.push(this.feedbackProvider.getAnalysis(feedback.id, undefined, true, siteId));
+                    p2.push(this.groupsProvider.getActivityGroupInfo(feedback.coursemodule, true, undefined, siteId, true)
                             .then((groupInfo) => {
                         const p3 = [],
                             userIds = [];
@@ -194,8 +190,8 @@ export class AddonModFeedbackPrefetchHandler extends CoreCourseActivityPrefetchH
                             groupInfo.groups = [{id: 0}];
                         }
                         groupInfo.groups.forEach((group) => {
-                            p3.push(this.feedbackProvider.getAnalysis(feedback.id, group.id, siteId));
-                            p3.push(this.feedbackProvider.getAllResponsesAnalysis(feedback.id, group.id, siteId)
+                            p3.push(this.feedbackProvider.getAnalysis(feedback.id, group.id, true, siteId));
+                            p3.push(this.feedbackProvider.getAllResponsesAnalysis(feedback.id, group.id, true, siteId)
                                     .then((responses) => {
                                 responses.attempts.forEach((attempt) => {
                                     userIds.push(attempt.userid);
@@ -203,7 +199,7 @@ export class AddonModFeedbackPrefetchHandler extends CoreCourseActivityPrefetchH
                             }));
 
                             if (!accessData.isanonymous) {
-                                p3.push(this.feedbackProvider.getAllNonRespondents(feedback.id, group.id, siteId)
+                                p3.push(this.feedbackProvider.getAllNonRespondents(feedback.id, group.id, true, siteId)
                                         .then((responses) => {
                                     responses.users.forEach((user) => {
                                         userIds.push(user.userid);
@@ -219,7 +215,13 @@ export class AddonModFeedbackPrefetchHandler extends CoreCourseActivityPrefetchH
                     }));
                 }
 
-                p2.push(this.feedbackProvider.getItems(feedback.id, siteId));
+                p2.push(this.feedbackProvider.getItems(feedback.id, true, siteId).then((response) => {
+                    response.items.forEach((item) => {
+                        files = files.concat(item.itemfiles);
+                    });
+
+                    return this.filepoolProvider.addFilesToQueue(siteId, files, this.component, module.id);
+                }));
 
                 if (accessData.cancomplete && accessData.cansubmit && !accessData.isempty) {
                     // Send empty data, so it will recover last completed feedback attempt values.
@@ -234,9 +236,7 @@ export class AddonModFeedbackPrefetchHandler extends CoreCourseActivityPrefetchH
                 }
 
                 return Promise.all(p2);
-            }));
-
-            return Promise.all(p1);
+            });
         });
     }
 }
diff --git a/src/addon/mod/feedback/providers/show-entries-link-handler.ts b/src/addon/mod/feedback/providers/show-entries-link-handler.ts
index fd32a42fe..d10c156da 100644
--- a/src/addon/mod/feedback/providers/show-entries-link-handler.ts
+++ b/src/addon/mod/feedback/providers/show-entries-link-handler.ts
@@ -65,7 +65,7 @@ export class AddonModFeedbackShowEntriesLinkHandler extends CoreContentLinksHand
                         return this.linkHelper.goInSite(navCtrl, 'AddonModFeedbackRespondentsPage', stateParams, siteId);
                     }
 
-                    return this.feedbackProvider.getAttempt(module.instance, params.showcompleted, siteId).then((attempt) => {
+                    return this.feedbackProvider.getAttempt(module.instance, params.showcompleted, true, siteId).then((attempt) => {
                         stateParams = {
                             moduleId: module.id,
                             attempt: attempt,
diff --git a/src/addon/mod/feedback/providers/sync.ts b/src/addon/mod/feedback/providers/sync.ts
index 0a9364b48..dc447d944 100644
--- a/src/addon/mod/feedback/providers/sync.ts
+++ b/src/addon/mod/feedback/providers/sync.ts
@@ -15,7 +15,6 @@
 import { Injectable } from '@angular/core';
 import { CoreLoggerProvider } from '@providers/logger';
 import { CoreSitesProvider } from '@providers/sites';
-import { CoreSyncBaseProvider } from '@classes/base-sync';
 import { CoreAppProvider } from '@providers/app';
 import { CoreUtilsProvider } from '@providers/utils/utils';
 import { CoreTextUtilsProvider } from '@providers/utils/text';
@@ -25,14 +24,17 @@ import { AddonModFeedbackProvider } from './feedback';
 import { CoreEventsProvider } from '@providers/events';
 import { TranslateService } from '@ngx-translate/core';
 import { CoreCourseProvider } from '@core/course/providers/course';
-import { CoreSyncProvider } from '@providers/sync';
+import { CoreCourseActivitySyncBaseProvider } from '@core/course/classes/activity-sync';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
+import { CoreCourseModulePrefetchDelegate } from '@core/course/providers/module-prefetch-delegate';
+import { CoreSyncProvider } from '@providers/sync';
+import { AddonModFeedbackPrefetchHandler } from './prefetch-handler';
 
 /**
  * Service to sync feedbacks.
  */
 @Injectable()
-export class AddonModFeedbackSyncProvider extends CoreSyncBaseProvider {
+export class AddonModFeedbackSyncProvider extends CoreCourseActivitySyncBaseProvider {
 
     static AUTO_SYNCED = 'addon_mod_feedback_autom_synced';
     protected componentTranslate: string;
@@ -42,13 +44,30 @@ export class AddonModFeedbackSyncProvider extends CoreSyncBaseProvider {
             private eventsProvider: CoreEventsProvider,  private feedbackProvider: AddonModFeedbackProvider,
             protected translate: TranslateService, private utils: CoreUtilsProvider, protected textUtils: CoreTextUtilsProvider,
             courseProvider: CoreCourseProvider, syncProvider: CoreSyncProvider, timeUtils: CoreTimeUtilsProvider,
-            private logHelper: CoreCourseLogHelperProvider) {
+            private logHelper: CoreCourseLogHelperProvider, prefetchDelegate: CoreCourseModulePrefetchDelegate,
+            prefetchHandler: AddonModFeedbackPrefetchHandler) {
+
         super('AddonModFeedbackSyncProvider', loggerProvider, sitesProvider, appProvider, syncProvider, textUtils, translate,
-                timeUtils);
+                timeUtils, prefetchDelegate, prefetchHandler);
 
         this.componentTranslate = courseProvider.translateModuleName('feedback');
     }
 
+    /**
+     * Conveniece function to prefetch data after an update.
+     *
+     * @param {any} module Module.
+     * @param {number} courseId Course ID.
+     * @param {RegExp} [regex] If regex matches, don't download the data. Defaults to check files and timers.
+     * @param {string} [siteId] Site ID. If not defined, current site.
+     * @return {Promise<any>} Promise resolved when done.
+     */
+    prefetchAfterUpdate(module: any, courseId: number, regex?: RegExp, siteId?: string): Promise<any> {
+        regex = regex || /^.*files$|^timers/;
+
+        return super.prefetchAfterUpdate(module, courseId, regex, siteId);
+    }
+
     /**
      * Try to synchronize all the feedbacks in a certain site or in all sites.
      *
@@ -196,7 +215,7 @@ export class AddonModFeedbackSyncProvider extends CoreSyncBaseProvider {
                     return Promise.all(promises);
                 }
 
-                return this.feedbackProvider.getCurrentCompletedTimeModified(feedbackId, siteId).then((timemodified) => {
+                return this.feedbackProvider.getCurrentCompletedTimeModified(feedbackId, true, siteId).then((timemodified) => {
                     // Sort by page.
                     responses.sort((a, b) => {
                         return a.page - b.page;
@@ -216,8 +235,8 @@ export class AddonModFeedbackSyncProvider extends CoreSyncBaseProvider {
             });
         }).then(() => {
             if (result.updated) {
-                // Data has been sent to server. Now invalidate the WS calls.
-                return this.feedbackProvider.invalidateAllFeedbackData(feedbackId, siteId).catch(() => {
+                // Data has been sent to server, update data.
+                return this.prefetchAfterUpdate(module, courseId, undefined, siteId).catch(() => {
                     // Ignore errors.
                 });
             }
diff --git a/src/addon/mod/lesson/components/index/index.ts b/src/addon/mod/lesson/components/index/index.ts
index ada4eded7..0f98b9444 100644
--- a/src/addon/mod/lesson/components/index/index.ts
+++ b/src/addon/mod/lesson/components/index/index.ts
@@ -61,6 +61,8 @@ export class AddonModLessonIndexComponent extends CoreCourseModuleMainActivityCo
     protected accessInfo: any; // Lesson access info.
     protected password: string; // The password for the lesson.
     protected hasPlayed: boolean; // Whether the user has gone to the lesson player (attempted).
+    protected dataSentObserver; // To detect data sent to server.
+    protected dataSent = false; // Whether some data was sent to server while playing the lesson.
 
     constructor(injector: Injector, protected lessonProvider: AddonModLessonProvider, @Optional() content: Content,
             protected groupsProvider: CoreGroupsProvider, protected lessonOffline: AddonModLessonOfflineProvider,
@@ -228,6 +230,13 @@ export class AddonModLessonIndexComponent extends CoreCourseModuleMainActivityCo
      * @return {boolean} If suceed or not.
      */
     protected hasSyncSucceed(result: any): boolean {
+        if (result.updated || this.dataSent) {
+            // Check completion status if something was sent.
+            this.courseProvider.checkModuleCompletion(this.courseId, this.module.completiondata);
+        }
+
+        this.dataSent = false;
+
         return result.updated;
     }
 
@@ -243,6 +252,10 @@ export class AddonModLessonIndexComponent extends CoreCourseModuleMainActivityCo
         if (this.hasPlayed) {
             this.hasPlayed = false;
 
+            this.dataSentObserver && this.dataSentObserver.off(); // Stop listening for changes.
+            this.dataSentObserver = undefined;
+
+            // Refresh data.
             this.showLoadingAndRefresh(true, false);
         }
     }
@@ -257,6 +270,16 @@ export class AddonModLessonIndexComponent extends CoreCourseModuleMainActivityCo
 
         if (this.navCtrl.getActive().component.name == 'AddonModLessonPlayerPage') {
             this.hasPlayed = true;
+
+            // Detect if anything was sent to server.
+            this.dataSentObserver && this.dataSentObserver.off();
+
+            this.dataSentObserver = this.eventsProvider.on(AddonModLessonProvider.DATA_SENT_EVENT, (data) => {
+                // Ignore launch sending because it only affects timers.
+                if (data.lessonId === this.lesson.id && data.type != 'launch') {
+                    this.dataSent = true;
+                }
+            }, this.siteId);
         }
     }
 
@@ -556,7 +579,18 @@ export class AddonModLessonIndexComponent extends CoreCourseModuleMainActivityCo
      * @return {Promise<any>} Promise resolved when done.
      */
     protected sync(): Promise<any> {
-        return this.lessonSync.syncLesson(this.lesson.id, true);
+        return this.lessonSync.syncLesson(this.lesson.id, true).then((result) => {
+            if (!result.updated && this.dataSent && this.isPrefetched()) {
+                // The user sent data to server, but not in the sync process. Check if we need to fetch data.
+                return this.lessonSync.prefetchAfterUpdate(this.module, this.courseId).catch(() => {
+                    // Ignore errors.
+                }).then(() => {
+                    return result;
+                });
+            }
+
+            return result;
+        });
     }
 
     /**
@@ -575,4 +609,13 @@ export class AddonModLessonIndexComponent extends CoreCourseModuleMainActivityCo
             return Promise.reject(error);
         });
     }
+
+    /**
+     * Component being destroyed.
+     */
+    ngOnDestroy(): void {
+        super.ngOnDestroy();
+
+        this.dataSentObserver && this.dataSentObserver.off();
+    }
 }
diff --git a/src/addon/mod/lesson/providers/lesson-sync.ts b/src/addon/mod/lesson/providers/lesson-sync.ts
index 68b741f94..d4c183285 100644
--- a/src/addon/mod/lesson/providers/lesson-sync.ts
+++ b/src/addon/mod/lesson/providers/lesson-sync.ts
@@ -25,7 +25,8 @@ import { CoreUrlUtilsProvider } from '@providers/utils/url';
 import { CoreUtilsProvider } from '@providers/utils/utils';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
-import { CoreSyncBaseProvider } from '@classes/base-sync';
+import { CoreCourseModulePrefetchDelegate } from '@core/course/providers/module-prefetch-delegate';
+import { CoreCourseActivitySyncBaseProvider } from '@core/course/classes/activity-sync';
 import { AddonModLessonProvider } from './lesson';
 import { AddonModLessonOfflineProvider } from './lesson-offline';
 import { AddonModLessonPrefetchHandler } from './prefetch-handler';
@@ -51,7 +52,7 @@ export interface AddonModLessonSyncResult {
  * Service to sync lesson.
  */
 @Injectable()
-export class AddonModLessonSyncProvider extends CoreSyncBaseProvider {
+export class AddonModLessonSyncProvider extends CoreCourseActivitySyncBaseProvider {
 
     static AUTO_SYNCED = 'addon_mod_lesson_autom_synced';
 
@@ -92,12 +93,12 @@ export class AddonModLessonSyncProvider extends CoreSyncBaseProvider {
             syncProvider: CoreSyncProvider, textUtils: CoreTextUtilsProvider, translate: TranslateService,
             courseProvider: CoreCourseProvider, private eventsProvider: CoreEventsProvider,
             private lessonProvider: AddonModLessonProvider, private lessonOfflineProvider: AddonModLessonOfflineProvider,
-            private prefetchHandler: AddonModLessonPrefetchHandler, timeUtils: CoreTimeUtilsProvider,
+            protected prefetchHandler: AddonModLessonPrefetchHandler, timeUtils: CoreTimeUtilsProvider,
             private utils: CoreUtilsProvider, private urlUtils: CoreUrlUtilsProvider,
-            private logHelper: CoreCourseLogHelperProvider) {
+            private logHelper: CoreCourseLogHelperProvider, prefetchDelegate: CoreCourseModulePrefetchDelegate) {
 
         super('AddonModLessonSyncProvider', loggerProvider, sitesProvider, appProvider, syncProvider, textUtils, translate,
-                timeUtils);
+                timeUtils, prefetchDelegate, prefetchHandler);
 
         this.componentTranslate = courseProvider.translateModuleName('lesson');
 
@@ -288,7 +289,7 @@ export class AddonModLessonSyncProvider extends CoreSyncBaseProvider {
             courseId = attempts[0].courseid;
 
             // Get the info, access info and the lesson password if needed.
-            return this.lessonProvider.getLessonById(courseId, lessonId, false, siteId).then((lessonData) => {
+            return this.lessonProvider.getLessonById(courseId, lessonId, false, false, siteId).then((lessonData) => {
                 lesson = lessonData;
 
                 return this.prefetchHandler.getLessonPassword(lessonId, false, true, askPassword, siteId);
@@ -364,7 +365,7 @@ export class AddonModLessonSyncProvider extends CoreSyncBaseProvider {
                     // Data already retrieved when syncing attempts.
                     promise = Promise.resolve();
                 } else {
-                    promise = this.lessonProvider.getLessonById(courseId, lessonId, false, siteId).then((lessonData) => {
+                    promise = this.lessonProvider.getLessonById(courseId, lessonId, false, false, siteId).then((lessonData) => {
                         lesson = lessonData;
 
                         return this.prefetchHandler.getLessonPassword(lessonId, false, true, askPassword, siteId);
@@ -429,31 +430,9 @@ export class AddonModLessonSyncProvider extends CoreSyncBaseProvider {
             });
         }).then(() => {
             if (result.updated && courseId) {
-                // Data has been sent to server. Now invalidate the WS calls.
-                const promises = [];
-
-                promises.push(this.lessonProvider.invalidateAccessInformation(lessonId, siteId));
-                promises.push(this.lessonProvider.invalidateContentPagesViewed(lessonId, siteId));
-                promises.push(this.lessonProvider.invalidateQuestionsAttempts(lessonId, siteId));
-                promises.push(this.lessonProvider.invalidatePagesPossibleJumps(lessonId, siteId));
-                promises.push(this.lessonProvider.invalidateTimers(lessonId, siteId));
-
-                return this.utils.allPromises(promises).catch(() => {
+                // Data has been sent to server, update data.
+                return this.prefetchAfterUpdate(module, courseId, undefined, siteId).catch(() => {
                     // Ignore errors.
-                }).then(() => {
-                    // Sync successful, update some data that might have been modified.
-                    return this.lessonProvider.getAccessInformation(lessonId, false, false, siteId).then((info) => {
-                        const promises = [],
-                            retake = info.attemptscount;
-
-                        promises.push(this.lessonProvider.getContentPagesViewedOnline(lessonId, retake, false, false, siteId));
-                        promises.push(this.lessonProvider.getQuestionsAttemptsOnline(lessonId, retake, false, undefined, false,
-                                false, siteId));
-
-                        return Promise.all(promises);
-                    }).catch(() => {
-                        // Ignore errors.
-                    });
                 });
             }
         }).then(() => {
diff --git a/src/addon/mod/lesson/providers/lesson.ts b/src/addon/mod/lesson/providers/lesson.ts
index e39b119cf..5441b3f3a 100644
--- a/src/addon/mod/lesson/providers/lesson.ts
+++ b/src/addon/mod/lesson/providers/lesson.ts
@@ -14,6 +14,7 @@
 
 import { Injectable } from '@angular/core';
 import { TranslateService } from '@ngx-translate/core';
+import { CoreEventsProvider } from '@providers/events';
 import { CoreLoggerProvider } from '@providers/logger';
 import { CoreSitesProvider, CoreSiteSchema } from '@providers/sites';
 import { CoreTextUtilsProvider } from '@providers/utils/text';
@@ -113,6 +114,7 @@ export interface AddonModLessonGrade {
 @Injectable()
 export class AddonModLessonProvider {
     static COMPONENT = 'mmaModLesson';
+    static DATA_SENT_EVENT = 'addon_mod_lesson_data_sent';
 
     // This page.
     static LESSON_THISPAGE = 0;
@@ -186,7 +188,8 @@ export class AddonModLessonProvider {
 
     constructor(logger: CoreLoggerProvider, private sitesProvider: CoreSitesProvider, private utils: CoreUtilsProvider,
             private translate: TranslateService, private textUtils: CoreTextUtilsProvider, private domUtils: CoreDomUtilsProvider,
-            private lessonOfflineProvider: AddonModLessonOfflineProvider, private logHelper: CoreCourseLogHelperProvider) {
+            private lessonOfflineProvider: AddonModLessonOfflineProvider, private logHelper: CoreCourseLogHelperProvider,
+            private eventsProvider: CoreEventsProvider) {
         this.logger = logger.getInstance('AddonModLessonProvider');
 
         this.sitesProvider.registerSiteSchema(this.siteSchema);
@@ -1087,7 +1090,17 @@ export class AddonModLessonProvider {
             });
         }
 
-        return this.finishRetakeOnline(lesson.id, password, outOfTime, review, siteId);
+        return this.finishRetakeOnline(lesson.id, password, outOfTime, review, siteId).then((response) => {
+            this.eventsProvider.trigger(AddonModLessonProvider.DATA_SENT_EVENT, {
+                lessonId: lesson.id,
+                type: 'finish',
+                courseId: courseId,
+                outOfTime: outOfTime,
+                review: review
+            }, this.sitesProvider.getCurrentSiteId());
+
+            return response;
+        });
     }
 
     /**
@@ -1363,11 +1376,12 @@ export class AddonModLessonProvider {
      * @param {number} courseId Course ID.
      * @param {number} cmid Course module ID.
      * @param {boolean} [forceCache] Whether it should always return cached data.
+     * @param {boolean} [ignoreCache] Whether it should ignore cached data (it will always fail in offline or server down).
      * @param {string} [siteId] Site ID. If not defined, current site.
      * @return {Promise<any>} Promise resolved when the lesson is retrieved.
      */
-    getLesson(courseId: number, cmId: number, forceCache?: boolean, siteId?: string): Promise<any> {
-        return this.getLessonByField(courseId, 'coursemodule', cmId, forceCache, siteId);
+    getLesson(courseId: number, cmId: number, forceCache?: boolean, ignoreCache?: boolean, siteId?: string): Promise<any> {
+        return this.getLessonByField(courseId, 'coursemodule', cmId, forceCache, ignoreCache, siteId);
     }
 
     /**
@@ -1377,10 +1391,12 @@ export class AddonModLessonProvider {
      * @param {string} key Name of the property to check.
      * @param {any} value Value to search.
      * @param {boolean} [forceCache] Whether it should always return cached data.
+     * @param {boolean} [ignoreCache] Whether it should ignore cached data (it will always fail in offline or server down).
      * @param {string} [siteId] Site ID. If not defined, current site.
      * @return {Promise<any>} Promise resolved when the lesson is retrieved.
      */
-    protected getLessonByField(courseId: number, key: string, value: any, forceCache?: boolean, siteId?: string): Promise<any> {
+    protected getLessonByField(courseId: number, key: string, value: any, forceCache?: boolean, ignoreCache?: boolean,
+            siteId?: string): Promise<any> {
 
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
@@ -1392,6 +1408,9 @@ export class AddonModLessonProvider {
 
             if (forceCache) {
                 preSets.omitExpires = true;
+            } else if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
             }
 
             return site.read('mod_lesson_get_lessons_by_courses', params, preSets).then((response) => {
@@ -1416,11 +1435,12 @@ export class AddonModLessonProvider {
      * @param {number} courseId Course ID.
      * @param {number} id Lesson ID.
      * @param {boolean} [forceCache] Whether it should always return cached data.
+     * @param {boolean} [ignoreCache] Whether it should ignore cached data (it will always fail in offline or server down).
      * @param {string} [siteId] Site ID. If not defined, current site.
      * @return {Promise<any>} Promise resolved when the lesson is retrieved.
      */
-    getLessonById(courseId: number, id: number, forceCache?: boolean, siteId?: string): Promise<any> {
-        return this.getLessonByField(courseId, 'id', id, forceCache, siteId);
+    getLessonById(courseId: number, id: number, forceCache?: boolean, ignoreCache?: boolean, siteId?: string): Promise<any> {
+        return this.getLessonByField(courseId, 'id', id, forceCache, ignoreCache, siteId);
     }
 
     /**
@@ -2758,7 +2778,14 @@ export class AddonModLessonProvider {
                 params.pageid = pageId;
             }
 
-            return site.write('mod_lesson_launch_attempt', params);
+            return site.write('mod_lesson_launch_attempt', params).then((response) => {
+                this.eventsProvider.trigger(AddonModLessonProvider.DATA_SENT_EVENT, {
+                    lessonId: id,
+                    type: 'launch'
+                }, this.sitesProvider.getCurrentSiteId());
+
+                return response;
+            });
         });
     }
 
@@ -3028,7 +3055,17 @@ export class AddonModLessonProvider {
             });
         }
 
-        return this.processPageOnline(lesson.id, pageId, data, password, review, siteId);
+        return this.processPageOnline(lesson.id, pageId, data, password, review, siteId).then((response) => {
+            this.eventsProvider.trigger(AddonModLessonProvider.DATA_SENT_EVENT, {
+                lessonId: lesson.id,
+                type: 'process',
+                courseId: courseId,
+                pageId: pageId,
+                review: review
+            }, this.sitesProvider.getCurrentSiteId());
+
+            return response;
+        });
     }
 
     /**
diff --git a/src/addon/mod/lesson/providers/prefetch-handler.ts b/src/addon/mod/lesson/providers/prefetch-handler.ts
index 17de0a1dd..3660a90cd 100644
--- a/src/addon/mod/lesson/providers/prefetch-handler.ts
+++ b/src/addon/mod/lesson/providers/prefetch-handler.ts
@@ -83,7 +83,7 @@ export class AddonModLessonPrefetchHandler extends CoreCourseActivityPrefetchHan
             password,
             result;
 
-        return this.lessonProvider.getLesson(courseId, module.id, false, siteId).then((lessonData) => {
+        return this.lessonProvider.getLesson(courseId, module.id, false, false, siteId).then((lessonData) => {
             lesson = lessonData;
 
             // Get the lesson password if it's needed.
@@ -190,7 +190,7 @@ export class AddonModLessonPrefetchHandler extends CoreCourseActivityPrefetchHan
         const siteId = this.sitesProvider.getCurrentSiteId();
 
         // Invalidate data to determine if module is downloadable.
-        return this.lessonProvider.getLesson(courseId, module.id, false, siteId).then((lesson) => {
+        return this.lessonProvider.getLesson(courseId, module.id, true, false, siteId).then((lesson) => {
             const promises = [];
 
             promises.push(this.lessonProvider.invalidateLessonData(courseId, siteId));
@@ -210,7 +210,7 @@ export class AddonModLessonPrefetchHandler extends CoreCourseActivityPrefetchHan
     isDownloadable(module: any, courseId: number): boolean | Promise<boolean> {
         const siteId = this.sitesProvider.getCurrentSiteId();
 
-        return this.lessonProvider.getLesson(courseId, module.id, false, siteId).then((lesson) => {
+        return this.lessonProvider.getLesson(courseId, module.id, false, false, siteId).then((lesson) => {
             if (!this.lessonProvider.isLessonOffline(lesson)) {
                 return false;
             }
@@ -260,7 +260,7 @@ export class AddonModLessonPrefetchHandler extends CoreCourseActivityPrefetchHan
             password,
             accessInfo;
 
-        return this.lessonProvider.getLesson(courseId, module.id, false, siteId).then((lessonData) => {
+        return this.lessonProvider.getLesson(courseId, module.id, false, true, siteId).then((lessonData) => {
             lesson = lessonData;
 
             // Get the lesson password if it's needed.
@@ -360,7 +360,8 @@ export class AddonModLessonPrefetchHandler extends CoreCourseActivityPrefetchHan
 
             if (accessInfo.canviewreports) {
                 // Prefetch reports data.
-                promises.push(this.groupsProvider.getActivityAllowedGroupsIfEnabled(module.id, undefined, siteId).then((groups) => {
+                promises.push(this.groupsProvider.getActivityAllowedGroupsIfEnabled(module.id, undefined, siteId, true)
+                        .then((groups) => {
                     const subPromises = [];
 
                     groups.forEach((group) => {
diff --git a/src/addon/mod/quiz/providers/prefetch-handler.ts b/src/addon/mod/quiz/providers/prefetch-handler.ts
index 794cd9c5b..d292dc958 100644
--- a/src/addon/mod/quiz/providers/prefetch-handler.ts
+++ b/src/addon/mod/quiz/providers/prefetch-handler.ts
@@ -50,6 +50,21 @@ export class AddonModQuizPrefetchHandler extends CoreCourseActivityPrefetchHandl
         super(translate, appProvider, utils, courseProvider, filepoolProvider, sitesProvider, domUtils);
     }
 
+    /**
+     * Download the module.
+     *
+     * @param {any} module The module object returned by WS.
+     * @param {number} courseId Course ID.
+     * @param {string} [dirPath] Path of the directory where to store all the content files.
+     * @param {boolean} [single] True if we're downloading a single module, false if we're downloading a whole section.
+     * @param {boolean} [canStart=true] If true, start a new attempt if needed.
+     * @return {Promise<any>} Promise resolved when all content is downloaded.
+     */
+    download(module: any, courseId: number, dirPath?: string, single?: boolean, canStart: boolean = true): Promise<any> {
+        // Same implementation for download and prefetch.
+        return this.prefetch(module, courseId, single, dirPath, canStart);
+    }
+
     /**
      * Get list of files. If not defined, we'll assume they're in module.contents.
      *
@@ -190,7 +205,7 @@ export class AddonModQuizPrefetchHandler extends CoreCourseActivityPrefetchHandl
 
         const siteId = this.sitesProvider.getCurrentSiteId();
 
-        return this.quizProvider.getQuiz(courseId, module.id, false, siteId).then((quiz) => {
+        return this.quizProvider.getQuiz(courseId, module.id, false, false, siteId).then((quiz) => {
             if (quiz.allowofflineattempts !== 1 || quiz.hasquestions === 0) {
                 return false;
             }
@@ -220,10 +235,11 @@ export class AddonModQuizPrefetchHandler extends CoreCourseActivityPrefetchHandl
      * @param {number} courseId Course ID the module belongs to.
      * @param {boolean} [single] True if we're downloading a single module, false if we're downloading a whole section.
      * @param {string} [dirPath] Path of the directory where to store all the content files.
+     * @param {boolean} [canStart=true] If true, start a new attempt if needed.
      * @return {Promise<any>} Promise resolved when done.
      */
-    prefetch(module: any, courseId?: number, single?: boolean, dirPath?: string): Promise<any> {
-        return this.prefetchPackage(module, courseId, single, this.prefetchQuiz.bind(this));
+    prefetch(module: any, courseId?: number, single?: boolean, dirPath?: string, canStart: boolean = true): Promise<any> {
+        return this.prefetchPackage(module, courseId, single, this.prefetchQuiz.bind(this), undefined, canStart);
     }
 
     /**
@@ -233,9 +249,10 @@ export class AddonModQuizPrefetchHandler extends CoreCourseActivityPrefetchHandl
      * @param {number} courseId Course ID the module belongs to.
      * @param {boolean} single True if we're downloading a single module, false if we're downloading a whole section.
      * @param {String} siteId Site ID.
+     * @param {boolean} canStart If true, start a new attempt if needed.
      * @return {Promise<any>} Promise resolved when done.
      */
-    protected prefetchQuiz(module: any, courseId: number, single: boolean, siteId: string): Promise<any> {
+    protected prefetchQuiz(module: any, courseId: number, single: boolean, siteId: string, canStart: boolean): Promise<any> {
         let attempts: any[],
             startAttempt = false,
             quiz,
@@ -244,7 +261,7 @@ export class AddonModQuizPrefetchHandler extends CoreCourseActivityPrefetchHandl
             preflightData;
 
         // Get quiz.
-        return this.quizProvider.getQuiz(courseId, module.id, false, siteId).then((quizData) => {
+        return this.quizProvider.getQuiz(courseId, module.id, false, true, siteId).then((quizData) => {
             quiz = quizData;
 
             const promises = [],
@@ -272,7 +289,13 @@ export class AddonModQuizPrefetchHandler extends CoreCourseActivityPrefetchHandl
         }).then(() => {
             // Check if we need to start a new attempt.
             let attempt = attempts[attempts.length - 1];
-            if (!attempt || this.quizProvider.isAttemptFinished(attempt.state)) {
+
+            if (!canStart && !attempt) {
+                // No attempts and we won't start a new one, so we don't need preflight data.
+                return;
+            }
+
+            if (canStart && (!attempt || this.quizProvider.isAttemptFinished(attempt.state))) {
                 // Check if the user can attempt the quiz.
                 if (attemptAccessInfo.preventnewattemptreasons.length) {
                     return Promise.reject(this.textUtils.buildMessage(attemptAccessInfo.preventnewattemptreasons));
@@ -331,6 +354,11 @@ export class AddonModQuizPrefetchHandler extends CoreCourseActivityPrefetchHandl
 
             return Promise.all(promises);
         }).then(() => {
+            if (!canStart) {
+                // Nothing else to do.
+                return;
+            }
+
             // If there's nothing to send, mark the quiz as synchronized.
             // We don't return the promises because it should be fast and we don't want to block the user for this.
             if (!this.syncProvider) {
@@ -477,14 +505,49 @@ export class AddonModQuizPrefetchHandler extends CoreCourseActivityPrefetchHandl
                 return this.prefetchAttempt(quiz, lastAttempt, preflightData, siteId);
             }
         }).then(() => {
-            // Prefetch finished, get current status to determine if we need to change it.
+            // Prefetch finished, set the right status.
+            return this.setStatusAfterPrefetch(quiz, attempts, true, false, siteId);
+        });
+    }
+
+    /**
+     * Set the right status to a quiz after prefetching.
+     * If the last attempt is finished or there isn't one, set it as not downloaded to show download icon.
+     *
+     * @param {any} quiz Quiz.
+     * @param  {any[]} [attempts] List of attempts. If not provided, they will be calculated.
+     * @param {boolean} [forceCache] Whether it should always return cached data. Only if attempts is undefined.
+     * @param {boolean} [ignoreCache] Whether it should ignore cached data (it will always fail in offline or server down). Only if
+     *                                attempts is undefined.
+     * @param {string} [siteId] Site ID. If not defined, current site.
+     * @return {Promise<any>} Promise resolved when done.
+     */
+    setStatusAfterPrefetch(quiz: any, attempts?: any[], forceCache?: boolean, ignoreCache?: boolean, siteId?: string)
+            : Promise<any> {
+        siteId = siteId || this.sitesProvider.getCurrentSiteId();
+
+        const promises = [];
+        let status;
+
+        if (!attempts) {
+            // Get the attempts.
+            promises.push(this.quizProvider.getUserAttempts(quiz.id, 'all', true, forceCache, ignoreCache, siteId).then((atts) => {
+                attempts = atts;
+            }));
+        }
+
+        // Check the current status of the quiz.
+        promises.push(this.filepoolProvider.getPackageStatus(siteId, this.component, quiz.coursemodule).then((stat) => {
+            status = stat;
+        }));
+
+        return Promise.all(promises).then(() => {
 
-            return this.filepoolProvider.getPackageStatus(siteId, this.component, quiz.coursemodule);
-        }).then((status) => {
             if (status !== CoreConstants.NOT_DOWNLOADED) {
                 // Quiz was downloaded, set the new status.
                 // If no attempts or last is finished we'll mark it as not downloaded to show download icon.
-                const isLastFinished = !lastAttempt || this.quizProvider.isAttemptFinished(lastAttempt.state),
+                const lastAttempt = attempts[attempts.length - 1],
+                    isLastFinished = !lastAttempt || this.quizProvider.isAttemptFinished(lastAttempt.state),
                     newStatus = isLastFinished ? CoreConstants.NOT_DOWNLOADED : CoreConstants.DOWNLOADED;
 
                 return this.filepoolProvider.storePackageStatus(siteId, newStatus, this.component, quiz.coursemodule);
diff --git a/src/addon/mod/quiz/providers/quiz-sync.ts b/src/addon/mod/quiz/providers/quiz-sync.ts
index f70b29109..854fb8a83 100644
--- a/src/addon/mod/quiz/providers/quiz-sync.ts
+++ b/src/addon/mod/quiz/providers/quiz-sync.ts
@@ -23,9 +23,10 @@ import { CoreTextUtilsProvider } from '@providers/utils/text';
 import { CoreTimeUtilsProvider } from '@providers/utils/time';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
+import { CoreCourseModulePrefetchDelegate } from '@core/course/providers/module-prefetch-delegate';
 import { CoreQuestionProvider } from '@core/question/providers/question';
 import { CoreQuestionDelegate } from '@core/question/providers/delegate';
-import { CoreSyncBaseProvider } from '@classes/base-sync';
+import { CoreCourseActivitySyncBaseProvider } from '@core/course/classes/activity-sync';
 import { AddonModQuizProvider } from './quiz';
 import { AddonModQuizOfflineProvider } from './quiz-offline';
 import { AddonModQuizPrefetchHandler } from './prefetch-handler';
@@ -51,7 +52,7 @@ export interface AddonModQuizSyncResult {
  * Service to sync quizzes.
  */
 @Injectable()
-export class AddonModQuizSyncProvider extends CoreSyncBaseProvider {
+export class AddonModQuizSyncProvider extends CoreCourseActivitySyncBaseProvider {
 
     static AUTO_SYNCED = 'addon_mod_quiz_autom_synced';
 
@@ -59,13 +60,14 @@ export class AddonModQuizSyncProvider extends CoreSyncBaseProvider {
 
     constructor(loggerProvider: CoreLoggerProvider, sitesProvider: CoreSitesProvider, appProvider: CoreAppProvider,
             syncProvider: CoreSyncProvider, textUtils: CoreTextUtilsProvider, translate: TranslateService,
-            courseProvider: CoreCourseProvider, private eventsProvider: CoreEventsProvider, timeUtils: CoreTimeUtilsProvider,
+            private eventsProvider: CoreEventsProvider, timeUtils: CoreTimeUtilsProvider,
             private quizProvider: AddonModQuizProvider, private quizOfflineProvider: AddonModQuizOfflineProvider,
-            private prefetchHandler: AddonModQuizPrefetchHandler, private questionProvider: CoreQuestionProvider,
-            private questionDelegate: CoreQuestionDelegate, private logHelper: CoreCourseLogHelperProvider) {
+            protected prefetchHandler: AddonModQuizPrefetchHandler, private questionProvider: CoreQuestionProvider,
+            private questionDelegate: CoreQuestionDelegate, private logHelper: CoreCourseLogHelperProvider,
+            prefetchDelegate: CoreCourseModulePrefetchDelegate, private courseProvider: CoreCourseProvider) {
 
         super('AddonModQuizSyncProvider', loggerProvider, sitesProvider, appProvider, syncProvider, textUtils, translate,
-                timeUtils);
+                timeUtils, prefetchDelegate, prefetchHandler);
 
         this.componentTranslate = courseProvider.translateModuleName('quiz');
     }
@@ -97,7 +99,11 @@ export class AddonModQuizSyncProvider extends CoreSyncBaseProvider {
         }).then(() => {
             if (updated) {
                 // Data has been sent. Update prefetched data.
-                return this.prefetchHandler.prefetchQuizAndLastAttempt(quiz, false, siteId);
+                return this.courseProvider.getModuleBasicInfoByInstance(quiz.id, 'quiz', siteId).then((module) => {
+                    return this.prefetchAfterUpdateQuiz(module, quiz, courseId, undefined, siteId);
+                }).catch(() => {
+                    // Ignore errors.
+                });
             }
         }).then(() => {
             return this.setSyncTime(quiz.id, siteId).catch(() => {
@@ -145,6 +151,41 @@ export class AddonModQuizSyncProvider extends CoreSyncBaseProvider {
         });
     }
 
+    /**
+     * Conveniece function to prefetch data after an update.
+     *
+     * @param {any} module Module.
+     * @param {any} quiz Quiz.
+     * @param {number} courseId Course ID.
+     * @param {RegExp} [regex] If regex matches, don't download the data. Defaults to check files.
+     * @param {string} [siteId] Site ID. If not defined, current site.
+     * @return {Promise<any>} Promise resolved when done.
+     */
+    prefetchAfterUpdateQuiz(module: any, quiz: any, courseId: number, regex?: RegExp, siteId?: string): Promise<any> {
+        regex = regex || /^.*files$/;
+
+        let shouldDownload;
+
+        // Get the module updates to check if the data was updated or not.
+        return this.prefetchDelegate.getModuleUpdates(module, courseId, true, siteId).then((result) => {
+
+            if (result && result.updates && result.updates.length > 0) {
+                // Only prefetch if files haven't changed.
+                shouldDownload = !result.updates.find((entry) => {
+                    return entry.name.match(regex);
+                });
+
+                if (shouldDownload) {
+                    return this.prefetchHandler.download(module, courseId, undefined, false, false);
+                }
+            }
+
+        }).then(() => {
+            // Prefetch finished or not needed, set the right status.
+            return this.prefetchHandler.setStatusAfterPrefetch(quiz, undefined, shouldDownload, false, siteId);
+        });
+    }
+
     /**
      * Try to synchronize all the quizzes in a certain site or in all sites.
      *
@@ -185,7 +226,7 @@ export class AddonModQuizSyncProvider extends CoreSyncBaseProvider {
                 if (!this.syncProvider.isBlocked(AddonModQuizProvider.COMPONENT, quiz.id, siteId)) {
 
                     // Quiz not blocked, try to synchronize it.
-                    promises.push(this.quizProvider.getQuizById(quiz.courseid, quiz.id, false, siteId).then((quiz) => {
+                    promises.push(this.quizProvider.getQuizById(quiz.courseid, quiz.id, false, false, siteId).then((quiz) => {
                         return this.syncQuizIfNeeded(quiz, false, siteId).then((data) => {
                             if (data && data.warnings && data.warnings.length) {
                                 // Store the warnings to show them when the user opens the quiz.
diff --git a/src/addon/mod/quiz/providers/quiz.ts b/src/addon/mod/quiz/providers/quiz.ts
index 551675b22..8861537f6 100644
--- a/src/addon/mod/quiz/providers/quiz.ts
+++ b/src/addon/mod/quiz/providers/quiz.ts
@@ -672,10 +672,13 @@ export class AddonModQuizProvider {
      * @param {string} key Name of the property to check.
      * @param {any} value Value to search.
      * @param {boolean} [forceCache] Whether it should always return cached data.
+     * @param {boolean} [ignoreCache] Whether it should ignore cached data (it will always fail in offline or server down).
      * @param {string} [siteId] Site ID. If not defined, current site.
      * @return {Promise<any>} Promise resolved when the Quiz is retrieved.
      */
-    protected getQuizByField(courseId: number, key: string, value: any, forceCache?: boolean, siteId?: string): Promise<any> {
+    protected getQuizByField(courseId: number, key: string, value: any, forceCache?: boolean, ignoreCache?: boolean,
+            siteId?: string): Promise<any> {
+
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     courseids: [courseId]
@@ -686,6 +689,9 @@ export class AddonModQuizProvider {
 
             if (forceCache) {
                 preSets.omitExpires = true;
+            } else if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
             }
 
             return site.read('mod_quiz_get_quizzes_by_courses', params, preSets).then((response) => {
@@ -710,11 +716,12 @@ export class AddonModQuizProvider {
      * @param {number} courseId Course ID.
      * @param {number} cmId Course module ID.
      * @param {boolean} [forceCache] Whether it should always return cached data.
+     * @param {boolean} [ignoreCache] Whether it should ignore cached data (it will always fail in offline or server down).
      * @param {string} [siteId] Site ID. If not defined, current site.
      * @return {Promise<any>} Promise resolved when the quiz is retrieved.
      */
-    getQuiz(courseId: number, cmId: number, forceCache?: boolean, siteId?: string): Promise<any> {
-        return this.getQuizByField(courseId, 'coursemodule', cmId, forceCache, siteId);
+    getQuiz(courseId: number, cmId: number, forceCache?: boolean, ignoreCache?: boolean, siteId?: string): Promise<any> {
+        return this.getQuizByField(courseId, 'coursemodule', cmId, forceCache, ignoreCache, siteId);
     }
 
     /**
@@ -723,11 +730,12 @@ export class AddonModQuizProvider {
      * @param {number} courseId Course ID.
      * @param {number} id Quiz ID.
      * @param {boolean} [forceCache] Whether it should always return cached data.
+     * @param {boolean} [ignoreCache] Whether it should ignore cached data (it will always fail in offline or server down).
      * @param {string} [siteId] Site ID. If not defined, current site.
      * @return {Promise<any>} Promise resolved when the quiz is retrieved.
      */
-    getQuizById(courseId: number, id: number, forceCache?: boolean, siteId?: string): Promise<any> {
-        return this.getQuizByField(courseId, 'id', id, forceCache, siteId);
+    getQuizById(courseId: number, id: number, forceCache?: boolean, ignoreCache?: boolean, siteId?: string): Promise<any> {
+        return this.getQuizByField(courseId, 'id', id, forceCache, ignoreCache, siteId);
     }
 
     /**
@@ -1223,7 +1231,7 @@ export class AddonModQuizProvider {
         siteId = siteId || this.sitesProvider.getCurrentSiteId();
 
         // Get required data to call the invalidate functions.
-       return this.getQuiz(courseId, moduleId, false, siteId).then((quiz) => {
+       return this.getQuiz(courseId, moduleId, true, false, siteId).then((quiz) => {
             return this.getUserAttempts(quiz.id, 'all', true, false, false, siteId).then((attempts) => {
                 // Now invalidate it.
                 const lastAttemptId = attempts.length ? attempts[attempts.length - 1].id : undefined;
diff --git a/src/addon/mod/scorm/providers/scorm-sync.ts b/src/addon/mod/scorm/providers/scorm-sync.ts
index 861dce5dc..683cfd450 100644
--- a/src/addon/mod/scorm/providers/scorm-sync.ts
+++ b/src/addon/mod/scorm/providers/scorm-sync.ts
@@ -25,7 +25,7 @@ import { CoreUtilsProvider } from '@providers/utils/utils';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
 import { CoreCourseModulePrefetchDelegate } from '@core/course/providers/module-prefetch-delegate';
-import { CoreSyncBaseProvider } from '@classes/base-sync';
+import { CoreCourseActivitySyncBaseProvider } from '@core/course/classes/activity-sync';
 import { AddonModScormProvider, AddonModScormAttemptCountResult } from './scorm';
 import { AddonModScormOfflineProvider } from './scorm-offline';
 import { AddonModScormPrefetchHandler } from './prefetch-handler';
@@ -57,7 +57,7 @@ export interface AddonModScormSyncResult {
  * Service to sync SCORMs.
  */
 @Injectable()
-export class AddonModScormSyncProvider extends CoreSyncBaseProvider {
+export class AddonModScormSyncProvider extends CoreCourseActivitySyncBaseProvider {
 
     static AUTO_SYNCED = 'addon_mod_scorm_autom_synced';
 
@@ -67,12 +67,12 @@ export class AddonModScormSyncProvider extends CoreSyncBaseProvider {
             syncProvider: CoreSyncProvider, textUtils: CoreTextUtilsProvider, translate: TranslateService,
             private eventsProvider: CoreEventsProvider, timeUtils: CoreTimeUtilsProvider,
             private scormProvider: AddonModScormProvider, private scormOfflineProvider: AddonModScormOfflineProvider,
-            private prefetchHandler: AddonModScormPrefetchHandler, private utils: CoreUtilsProvider,
-            private prefetchDelegate: CoreCourseModulePrefetchDelegate, private courseProvider: CoreCourseProvider,
+            prefetchHandler: AddonModScormPrefetchHandler, private utils: CoreUtilsProvider,
+            prefetchDelegate: CoreCourseModulePrefetchDelegate, private courseProvider: CoreCourseProvider,
             private logHelper: CoreCourseLogHelperProvider) {
 
         super('AddonModScormSyncProvider', loggerProvider, sitesProvider, appProvider, syncProvider, textUtils, translate,
-                timeUtils);
+                timeUtils, prefetchDelegate, prefetchHandler);
 
         this.componentTranslate = courseProvider.translateModuleName('scorm');
     }
@@ -196,7 +196,7 @@ export class AddonModScormSyncProvider extends CoreSyncBaseProvider {
         if (updated) {
             // Update downloaded data.
             promise = this.courseProvider.getModuleBasicInfoByInstance(scorm.id, 'scorm', siteId).then((module) => {
-                return this.prefetchAfterUpdate(module, scorm.course);
+                return this.prefetchAfterUpdate(module, scorm.course, undefined, siteId);
             }).catch(() => {
                 // Ignore errors.
             });
@@ -361,31 +361,6 @@ export class AddonModScormSyncProvider extends CoreSyncBaseProvider {
         });
     }
 
-    /**
-     * Prefetch data after an update. It won't prefetch the data if the package file was updated.
-     *
-     * @param {any} module Module.
-     * @param {number} courseId Course ID.
-     * @param {string} [siteId] Site ID. If not defined, current site.
-     * @return {Promise<any>} Promise resolved when done.
-     */
-    prefetchAfterUpdate(module: any, courseId: number, siteId?: string): Promise<any> {
-        // Get the module updates to check if the package was updated or not.
-        return this.prefetchDelegate.getModuleUpdates(module, courseId, true, siteId).then((result) => {
-
-            if (result && result.updates) {
-                // Only prefetch if the package file hasn't changed.
-                const fileChanged = !!result.updates.find((entry) => {
-                    return entry.name == 'packagefiles';
-                });
-
-                if (!fileChanged) {
-                    return this.prefetchHandler.download(module, courseId);
-                }
-            }
-        });
-    }
-
     /**
      * Save a snapshot from a synchronization.
      *
diff --git a/src/addon/mod/survey/components/index/index.ts b/src/addon/mod/survey/components/index/index.ts
index 581064e0e..3a7eb4151 100644
--- a/src/addon/mod/survey/components/index/index.ts
+++ b/src/addon/mod/survey/components/index/index.ts
@@ -188,8 +188,20 @@ export class AddonModSurveyIndexComponent extends CoreCourseModuleMainActivityCo
                 });
             }
 
-            return this.surveyProvider.submitAnswers(this.survey.id, this.survey.name, this.courseId, answers).then(() => {
-                return this.showLoadingAndRefresh(false);
+            return this.surveyProvider.submitAnswers(this.survey.id, this.survey.name, this.courseId, answers).then((online) => {
+                if (online && this.isPrefetched()) {
+                    // The survey is downloaded, update the data.
+                    return this.surveySync.prefetchAfterUpdate(this.module, this.courseId).then(() => {
+                        // Update the view.
+                        this.showLoadingAndFetch(false, false);
+                    }).catch((error) => {
+                        // Prefetch failed, refresh the data.
+                        return this.showLoadingAndRefresh(false);
+                    });
+                } else {
+                    // Not downloaded, refresh the data.
+                    return this.showLoadingAndRefresh(false);
+                }
             }).finally(() => {
                 modal.dismiss();
             });
diff --git a/src/addon/mod/survey/providers/prefetch-handler.ts b/src/addon/mod/survey/providers/prefetch-handler.ts
index b3ac45ea6..e6b785486 100644
--- a/src/addon/mod/survey/providers/prefetch-handler.ts
+++ b/src/addon/mod/survey/providers/prefetch-handler.ts
@@ -111,7 +111,7 @@ export class AddonModSurveyPrefetchHandler extends CoreCourseActivityPrefetchHan
      * @return {Promise<any>} Promise resolved when done.
      */
     protected prefetchSurvey(module: any, courseId: number, single: boolean, siteId: string): Promise<any> {
-        return this.surveyProvider.getSurvey(courseId, module.id).then((survey) => {
+        return this.surveyProvider.getSurvey(courseId, module.id, true, siteId).then((survey) => {
             const promises = [],
                 files = this.getIntroFilesFromInstance(module, survey);
 
@@ -120,7 +120,7 @@ export class AddonModSurveyPrefetchHandler extends CoreCourseActivityPrefetchHan
 
             // If survey isn't answered, prefetch the questions.
             if (!survey.surveydone) {
-                promises.push(this.surveyProvider.getQuestions(survey.id));
+                promises.push(this.surveyProvider.getQuestions(survey.id, true, siteId));
             }
 
             return Promise.all(promises);
diff --git a/src/addon/mod/survey/providers/survey.ts b/src/addon/mod/survey/providers/survey.ts
index 75bd970d0..ff376e2f8 100644
--- a/src/addon/mod/survey/providers/survey.ts
+++ b/src/addon/mod/survey/providers/survey.ts
@@ -20,6 +20,7 @@ import { CoreAppProvider } from '@providers/app';
 import { CoreFilepoolProvider } from '@providers/filepool';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
 import { AddonModSurveyOfflineProvider } from './offline';
+import { CoreSiteWSPreSets } from '@classes/site';
 
 /**
  * Service that provides some features for surveys.
@@ -41,18 +42,24 @@ export class AddonModSurveyProvider {
      * Get a survey's questions.
      *
      * @param {number} surveyId Survey ID.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @param {string} [siteId] Site ID. If not defined, current site.
      * @return {Promise<any>}  Promise resolved when the questions are retrieved.
      */
-    getQuestions(surveyId: number, siteId?: string): Promise<any> {
+    getQuestions(surveyId: number, ignoreCache?: boolean, siteId?: string): Promise<any> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     surveyid: surveyId
                 },
-                preSets = {
+                preSets: CoreSiteWSPreSets = {
                     cacheKey: this.getQuestionsCacheKey(surveyId)
                 };
 
+            if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
+            }
+
             return site.read('mod_survey_get_questions', params, preSets).then((response) => {
                 if (response.questions) {
                     return response.questions;
@@ -87,20 +94,26 @@ export class AddonModSurveyProvider {
      * Get a survey data.
      *
      * @param {number} courseId Course ID.
-     * @param {string} key     Name of the property to check.
-     * @param {any}  value   Value to search.
+     * @param {string} key Name of the property to check.
+     * @param {any} value Value to search.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @param {string} [siteId] Site ID. If not defined, current site.
      * @return {Promise<any>}  Promise resolved when the survey is retrieved.
      */
-    protected getSurveyDataByKey(courseId: number, key: string, value: any, siteId?: string): Promise<any> {
+    protected getSurveyDataByKey(courseId: number, key: string, value: any, ignoreCache?: boolean, siteId?: string): Promise<any> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             const params = {
                     courseids: [courseId]
                 },
-                preSets = {
+                preSets: CoreSiteWSPreSets = {
                     cacheKey: this.getSurveyCacheKey(courseId)
                 };
 
+            if (ignoreCache) {
+                preSets.getFromCache = false;
+                preSets.emergencyCache = false;
+            }
+
             return site.read('mod_survey_get_surveys_by_courses', params, preSets).then((response) => {
                 if (response && response.surveys) {
                     const currentSurvey = response.surveys.find((survey) => {
@@ -120,24 +133,26 @@ export class AddonModSurveyProvider {
      * Get a survey by course module ID.
      *
      * @param {number} courseId Course ID.
-     * @param {number} cmId     Course module ID.
+     * @param {number} cmId Course module ID.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @param {string} [siteId] Site ID. If not defined, current site.
      * @return {Promise<any>}   Promise resolved when the survey is retrieved.
      */
-    getSurvey(courseId: number, cmId: number, siteId?: string): Promise<any> {
-        return this.getSurveyDataByKey(courseId, 'coursemodule', cmId, siteId);
+    getSurvey(courseId: number, cmId: number, ignoreCache?: boolean, siteId?: string): Promise<any> {
+        return this.getSurveyDataByKey(courseId, 'coursemodule', cmId, ignoreCache, siteId);
     }
 
     /**
      * Get a survey by ID.
      *
-     * @param {number} courseId  Course ID.
-     * @param {number} id        Survey ID.
+     * @param {number} courseId Course ID.
+     * @param {number} id Survey ID.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @param {string} [siteId]  Site ID. If not defined, current site.
      * @return {Promise<any>}         Promise resolved when the survey is retrieved.
      */
-    getSurveyById(courseId: number, id: number, siteId?: string): Promise<any> {
-        return this.getSurveyDataByKey(courseId, 'id', id, siteId);
+    getSurveyById(courseId: number, id: number, ignoreCache?: boolean, siteId?: string): Promise<any> {
+        return this.getSurveyDataByKey(courseId, 'id', id, ignoreCache, siteId);
     }
 
     /**
diff --git a/src/addon/mod/survey/providers/sync.ts b/src/addon/mod/survey/providers/sync.ts
index 2e301f5fa..7ade2bb70 100644
--- a/src/addon/mod/survey/providers/sync.ts
+++ b/src/addon/mod/survey/providers/sync.ts
@@ -15,7 +15,6 @@
 import { Injectable } from '@angular/core';
 import { CoreLoggerProvider } from '@providers/logger';
 import { CoreSitesProvider } from '@providers/sites';
-import { CoreSyncBaseProvider } from '@classes/base-sync';
 import { CoreAppProvider } from '@providers/app';
 import { CoreUtilsProvider } from '@providers/utils/utils';
 import { CoreTextUtilsProvider } from '@providers/utils/text';
@@ -26,13 +25,16 @@ import { CoreEventsProvider } from '@providers/events';
 import { TranslateService } from '@ngx-translate/core';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseLogHelperProvider } from '@core/course/providers/log-helper';
+import { CoreCourseModulePrefetchDelegate } from '@core/course/providers/module-prefetch-delegate';
+import { CoreCourseActivitySyncBaseProvider } from '@core/course/classes/activity-sync';
 import { CoreSyncProvider } from '@providers/sync';
+import { AddonModSurveyPrefetchHandler } from './prefetch-handler';
 
 /**
  * Service to sync surveys.
  */
 @Injectable()
-export class AddonModSurveySyncProvider extends CoreSyncBaseProvider {
+export class AddonModSurveySyncProvider extends CoreCourseActivitySyncBaseProvider {
 
     static AUTO_SYNCED = 'addon_mod_survey_autom_synced';
     protected componentTranslate: string;
@@ -41,10 +43,11 @@ export class AddonModSurveySyncProvider extends CoreSyncBaseProvider {
             syncProvider: CoreSyncProvider, textUtils: CoreTextUtilsProvider, translate: TranslateService,
             courseProvider: CoreCourseProvider, private surveyOffline: AddonModSurveyOfflineProvider,
             private eventsProvider: CoreEventsProvider,  private surveyProvider: AddonModSurveyProvider,
-            private utils: CoreUtilsProvider, timeUtils: CoreTimeUtilsProvider, private logHelper: CoreCourseLogHelperProvider) {
+            private utils: CoreUtilsProvider, timeUtils: CoreTimeUtilsProvider, private logHelper: CoreCourseLogHelperProvider,
+            prefetchDelegate: CoreCourseModulePrefetchDelegate, prefetchHandler: AddonModSurveyPrefetchHandler) {
 
         super('AddonModSurveySyncProvider', loggerProvider, sitesProvider, appProvider, syncProvider, textUtils, translate,
-                timeUtils);
+                timeUtils, prefetchDelegate, prefetchHandler);
 
         this.componentTranslate = courseProvider.translateModuleName('survey');
     }
@@ -57,7 +60,7 @@ export class AddonModSurveySyncProvider extends CoreSyncBaseProvider {
      * @return {string}          Sync ID.
      * @protected
      */
-    getSyncId (surveyId: number, userId: number): string {
+    getSyncId(surveyId: number, userId: number): string {
         return surveyId + '#' + userId;
     }
 
@@ -192,9 +195,7 @@ export class AddonModSurveySyncProvider extends CoreSyncBaseProvider {
         }).then(() => {
             if (courseId) {
                 // Data has been sent to server, update survey data.
-                return this.surveyProvider.invalidateSurveyData(courseId, siteId).then(() => {
-                    return this.surveyProvider.getSurveyById(courseId, surveyId, siteId);
-                }).catch(() => {
+                return this.prefetchAfterUpdate(module, courseId, undefined, siteId).catch(() => {
                     // Ignore errors.
                 });
             }
diff --git a/src/addon/qtype/truefalse/providers/handler.ts b/src/addon/qtype/truefalse/providers/handler.ts
index 59c47fdff..3be03abde 100644
--- a/src/addon/qtype/truefalse/providers/handler.ts
+++ b/src/addon/qtype/truefalse/providers/handler.ts
@@ -84,4 +84,20 @@ export class AddonQtypeTrueFalseHandler implements CoreQuestionHandler {
     isSameResponse(question: any, prevAnswers: any, newAnswers: any): boolean {
         return this.utils.sameAtKeyMissingIsBlank(prevAnswers, newAnswers, 'answer');
     }
+
+    /**
+     * Prepare and add to answers the data to send to server based in the input. Return promise if async.
+     *
+     * @param {any} question Question.
+     * @param {any} answers The answers retrieved from the form. Prepared answers must be stored in this object.
+     * @param {boolean} [offline] Whether the data should be saved in offline.
+     * @param {string} [siteId] Site ID. If not defined, current site.
+     * @return {void|Promise<any>} Return a promise resolved when done if async, void if sync.
+     */
+    prepareAnswers(question: any, answers: any, offline: boolean, siteId?: string): void | Promise<any> {
+        if (question && typeof answers[question.optionsName] != 'undefined' && !answers[question.optionsName]) {
+            // The user hasn't answered. Delete the answer to prevent marking one of the answers automatically.
+            delete answers[question.optionsName];
+        }
+    }
 }
diff --git a/src/classes/base-sync.ts b/src/classes/base-sync.ts
index f4a2bb436..d247783da 100644
--- a/src/classes/base-sync.ts
+++ b/src/classes/base-sync.ts
@@ -46,9 +46,6 @@ export class CoreSyncBaseProvider {
     // Store sync promises.
     protected syncPromises: { [siteId: string]: { [uniqueId: string]: Promise<any> } } = {};
 
-    // List of services that will be injected using injector.
-    // It's done like this so subclasses don't have to send all the services to the parent in the constructor.
-
     constructor(component: string, loggerProvider: CoreLoggerProvider, protected sitesProvider: CoreSitesProvider,
             protected appProvider: CoreAppProvider, protected syncProvider: CoreSyncProvider,
             protected textUtils: CoreTextUtilsProvider, protected translate: TranslateService,
diff --git a/src/core/course/classes/activity-sync.ts b/src/core/course/classes/activity-sync.ts
new file mode 100644
index 000000000..8d7333963
--- /dev/null
+++ b/src/core/course/classes/activity-sync.ts
@@ -0,0 +1,67 @@
+// (C) Copyright 2015 Martin Dougiamas
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { TranslateService } from '@ngx-translate/core';
+import { CoreSitesProvider } from '@providers/sites';
+import { CoreSyncProvider } from '@providers/sync';
+import { CoreLoggerProvider } from '@providers/logger';
+import { CoreAppProvider } from '@providers/app';
+import { CoreTextUtilsProvider } from '@providers/utils/text';
+import { CoreTimeUtilsProvider } from '@providers/utils/time';
+import { CoreSyncBaseProvider } from '@classes/base-sync';
+import { CoreCourseModulePrefetchDelegate } from '@core/course/providers/module-prefetch-delegate';
+import { CoreCourseModulePrefetchHandlerBase } from './module-prefetch-handler';
+
+/**
+ * Base class to create activity sync providers. It provides some common functions.
+ */
+export class CoreCourseActivitySyncBaseProvider extends CoreSyncBaseProvider {
+
+    constructor(component: string, loggerProvider: CoreLoggerProvider, protected sitesProvider: CoreSitesProvider,
+            protected appProvider: CoreAppProvider, protected syncProvider: CoreSyncProvider,
+            protected textUtils: CoreTextUtilsProvider, protected translate: TranslateService,
+            protected timeUtils: CoreTimeUtilsProvider, protected prefetchDelegate: CoreCourseModulePrefetchDelegate,
+            protected prefetchHandler: CoreCourseModulePrefetchHandlerBase) {
+
+        super(component, loggerProvider, sitesProvider, appProvider, syncProvider, textUtils, translate, timeUtils);
+    }
+
+    /**
+     * Conveniece function to prefetch data after an update.
+     *
+     * @param {any} module Module.
+     * @param {number} courseId Course ID.
+     * @param {RegExp} [regex] If regex matches, don't download the data. Defaults to check files.
+     * @param {string} [siteId] Site ID. If not defined, current site.
+     * @return {Promise<any>} Promise resolved when done.
+     */
+    prefetchAfterUpdate(module: any, courseId: number, regex?: RegExp, siteId?: string): Promise<any> {
+        regex = regex || /^.*files$/;
+
+        // Get the module updates to check if the data was updated or not.
+        return this.prefetchDelegate.getModuleUpdates(module, courseId, true, siteId).then((result) => {
+
+            if (result && result.updates && result.updates.length > 0) {
+                // Only prefetch if files haven't changed.
+                const shouldDownload = !result.updates.find((entry) => {
+                    return entry.name.match(regex);
+                });
+
+                if (shouldDownload) {
+                    return this.prefetchHandler.download(module, courseId);
+                }
+            }
+        });
+    }
+}
diff --git a/src/core/course/classes/main-resource-component.ts b/src/core/course/classes/main-resource-component.ts
index 8bc986812..42727c13f 100644
--- a/src/core/course/classes/main-resource-component.ts
+++ b/src/core/course/classes/main-resource-component.ts
@@ -23,6 +23,7 @@ import { CoreCourseModuleMainComponent, CoreCourseModuleDelegate } from '@core/c
 import { CoreCourseSectionPage } from '@core/course/pages/section/section.ts';
 import { CoreContentLinksHelperProvider } from '@core/contentlinks/providers/helper';
 import { AddonBlogProvider } from '@addon/blog/providers/blog';
+import { CoreConstants } from '@core/constants';
 
 /**
  * Template class to easily create CoreCourseModuleMainComponent of resources (or activities without syncing).
@@ -42,6 +43,7 @@ export class CoreCourseModuleMainResourceComponent implements OnInit, OnDestroy,
     description: string; // Module description.
     refreshIcon: string; // Refresh icon, normally spinner or refresh.
     prefetchStatusIcon: string; // Used when calling fillContextMenu.
+    prefetchStatus: string; // Used when calling fillContextMenu.
     prefetchText: string; // Used when calling fillContextMenu.
     size: string; // Used when calling fillContextMenu.
 
@@ -222,6 +224,14 @@ export class CoreCourseModuleMainResourceComponent implements OnInit, OnDestroy,
         this.courseHelper.fillContextMenu(this, this.module, this.courseId, refresh, this.component);
     }
 
+    /**
+     * Check if the module is prefetched or being prefetched. To make it faster, just use the data calculated by fillContextMenu.
+     * This means that you need to call fillContextMenu to make this work.
+     */
+    protected isPrefetched(): boolean {
+        return this.prefetchStatus != CoreConstants.NOT_DOWNLOADABLE && this.prefetchStatus != CoreConstants.NOT_DOWNLOADED;
+    }
+
     /**
      * Expand the description.
      */
diff --git a/src/core/course/providers/helper.ts b/src/core/course/providers/helper.ts
index 3a6b746ac..448af929d 100644
--- a/src/core/course/providers/helper.ts
+++ b/src/core/course/providers/helper.ts
@@ -745,6 +745,7 @@ export class CoreCourseHelperProvider {
         return this.getModulePrefetchInfo(module, courseId, invalidateCache, component).then((moduleInfo) => {
             instance.size = moduleInfo.size > 0 ? moduleInfo.sizeReadable : 0;
             instance.prefetchStatusIcon = moduleInfo.statusIcon;
+            instance.prefetchStatus = moduleInfo.status;
 
             if (moduleInfo.status != CoreConstants.NOT_DOWNLOADABLE) {
                 // Module is downloadable, get the text to display to prefetch.
diff --git a/src/providers/groups.ts b/src/providers/groups.ts
index 437e6e03f..f2ce0b146 100644
--- a/src/providers/groups.ts
+++ b/src/providers/groups.ts
@@ -124,16 +124,17 @@ export class CoreGroupsProvider {
      * @param {number} cmId Course module ID.
      * @param {number} [userId] User ID. If not defined, use current user.
      * @param {string} [siteId] Site ID. If not defined, current site.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @return {Promise<any[]>} Promise resolved when the groups are retrieved. If not allowed, empty array will be returned.
      */
-    getActivityAllowedGroupsIfEnabled(cmId: number, userId?: number, siteId?: string): Promise<any[]> {
+    getActivityAllowedGroupsIfEnabled(cmId: number, userId?: number, siteId?: string, ignoreCache?: boolean): Promise<any[]> {
         siteId = siteId || this.sitesProvider.getCurrentSiteId();
 
         // Get real groupmode, in case it's forced by the course.
-        return this.activityHasGroups(cmId, siteId).then((hasGroups) => {
+        return this.activityHasGroups(cmId, siteId, ignoreCache).then((hasGroups) => {
             if (hasGroups) {
                 // Get the groups available for the user.
-                return this.getActivityAllowedGroups(cmId, userId, siteId);
+                return this.getActivityAllowedGroups(cmId, userId, siteId, ignoreCache);
             }
 
             return [];
@@ -147,19 +148,22 @@ export class CoreGroupsProvider {
      * @param {boolean} [addAllParts=true] Whether to add the all participants option. Always true for visible groups.
      * @param {number} [userId] User ID. If not defined, use current user.
      * @param {string} [siteId] Site ID. If not defined, current site.
+     * @param {boolean} [ignoreCache] True if it should ignore cached data (it will always fail in offline or server down).
      * @return {Promise<CoreGroupInfo>} Promise resolved with the group info.
      */
-    getActivityGroupInfo(cmId: number, addAllParts: boolean = true, userId?: number, siteId?: string): Promise<CoreGroupInfo> {
+    getActivityGroupInfo(cmId: number, addAllParts: boolean = true, userId?: number, siteId?: string, ignoreCache?: boolean)
+            : Promise<CoreGroupInfo> {
+
         const groupInfo: CoreGroupInfo = {
             groups: []
         };
 
-        return this.getActivityGroupMode(cmId, siteId).then((groupMode) => {
+        return this.getActivityGroupMode(cmId, siteId, ignoreCache).then((groupMode) => {
             groupInfo.separateGroups = groupMode === CoreGroupsProvider.SEPARATEGROUPS;
             groupInfo.visibleGroups = groupMode === CoreGroupsProvider.VISIBLEGROUPS;
 
             if (groupInfo.separateGroups || groupInfo.visibleGroups) {
-                return this.getActivityAllowedGroups(cmId, userId, siteId);
+                return this.getActivityAllowedGroups(cmId, userId, siteId, ignoreCache);
             }
 
             return [];