diff --git a/nextjs/src/app/course/[courseName]/context/DraggingContextProvider.tsx b/nextjs/src/app/course/[courseName]/context/DraggingContextProvider.tsx
index 7e47db2..d5acadb 100644
--- a/nextjs/src/app/course/[courseName]/context/DraggingContextProvider.tsx
+++ b/nextjs/src/app/course/[courseName]/context/DraggingContextProvider.tsx
@@ -3,6 +3,8 @@ import { ReactNode, useCallback, DragEvent } from "react";
 import { DraggingContext } from "./draggingContext";
 import { useUpdateQuizMutation } from "@/hooks/localCourse/quizHooks";
 import { useLocalCourseSettingsQuery } from "@/hooks/localCourse/localCoursesHooks";
+import { LocalQuiz } from "@/models/local/quiz/localQuiz";
+import { getDateFromStringOrThrow, dateToMarkdownString } from "@/models/local/timeUtils";
 
 export default function DraggingContextProvider({
   children,
@@ -15,47 +17,47 @@ export default function DraggingContextProvider({
 
   const itemDrop = useCallback(
     (e: DragEvent<HTMLDivElement>, day: string | undefined) => {
-      // const itemBeingDragged = JSON.parse(
-      //   e.dataTransfer.getData("draggableItem")
-      // );
+      const itemBeingDragged = JSON.parse(
+        e.dataTransfer.getData("draggableItem")
+      );
 
-      // if (itemBeingDragged && day) {
-      //   const dayAsDate = getDateFromStringOrThrow(day, "in drop callback");
-      //   dayAsDate.setHours(settings.defaultDueTime.hour);
-      //   dayAsDate.setMinutes(settings.defaultDueTime.minute);
-      //   dayAsDate.setSeconds(0);
+      if (itemBeingDragged && day) {
+        const dayAsDate = getDateFromStringOrThrow(day, "in drop callback");
+        dayAsDate.setHours(settings.defaultDueTime.hour);
+        dayAsDate.setMinutes(settings.defaultDueTime.minute);
+        dayAsDate.setSeconds(0);
 
-      //   console.log("dropped on day", dayAsDate, day);
-      //   if (itemBeingDragged.type === "quiz") {
-      //     console.log("dropping quiz");
-      //     const previousQuiz = itemBeingDragged.item as LocalQuiz;
+        console.log("dropped on day", dayAsDate, day);
+        if (itemBeingDragged.type === "quiz") {
+          console.log("dropping quiz");
+          const previousQuiz = itemBeingDragged.item as LocalQuiz;
 
-      //     const quiz: LocalQuiz = {
-      //       ...previousQuiz,
-      //       dueAt: dateToMarkdownString(dayAsDate),
-      //       lockAt:
-      //         previousQuiz.lockAt &&
-      //         (getDateFromStringOrThrow(previousQuiz.lockAt, "lockAt date") >
-      //         dayAsDate
-      //           ? previousQuiz.lockAt
-      //           : dateToMarkdownString(dayAsDate)),
-      //     };
-      //     updateQuizMutation.mutate({
-      //       quiz: quiz,
-      //       quizName: quiz.name,
-      //       moduleName: itemBeingDragged.sourceModuleName,
-      //     });
-      //   } else if (itemBeingDragged.type === "assignment") {
-      //     console.log("dropped assignment");
-      //   } else if (itemBeingDragged.type === "page") {
-      //     console.log("dropped page");
-      //   }
-      // }
+          const quiz: LocalQuiz = {
+            ...previousQuiz,
+            dueAt: dateToMarkdownString(dayAsDate),
+            lockAt:
+              previousQuiz.lockAt &&
+              (getDateFromStringOrThrow(previousQuiz.lockAt, "lockAt date") >
+              dayAsDate
+                ? previousQuiz.lockAt
+                : dateToMarkdownString(dayAsDate)),
+          };
+          updateQuizMutation.mutate({
+            quiz: quiz,
+            quizName: quiz.name,
+            moduleName: itemBeingDragged.sourceModuleName,
+          });
+        } else if (itemBeingDragged.type === "assignment") {
+          console.log("dropped assignment");
+        } else if (itemBeingDragged.type === "page") {
+          console.log("dropped page");
+        }
+      }
     },
     [
-      // settings.defaultDueTime.hour,
-      // settings.defaultDueTime.minute,
-      // updateQuizMutation,
+      settings.defaultDueTime.hour,
+      settings.defaultDueTime.minute,
+      updateQuizMutation,
     ]
   );
 
diff --git a/nextjs/src/hooks/localCourse/quizHooks.ts b/nextjs/src/hooks/localCourse/quizHooks.ts
index 6f14555..7b9e1bc 100644
--- a/nextjs/src/hooks/localCourse/quizHooks.ts
+++ b/nextjs/src/hooks/localCourse/quizHooks.ts
@@ -1,4 +1,4 @@
-"use client"
+"use client";
 import { LocalQuiz } from "@/models/local/quiz/localQuiz";
 import {
   useMutation,
@@ -68,7 +68,7 @@ function getQuizQueryConfig(
 
 export const useUpdateQuizMutation = () => {
   const { courseName } = useCourseContext();
-  // const queryClient = useQueryClient();
+  const queryClient = useQueryClient();
   return useMutation({
     mutationFn: async ({
       quiz,
@@ -86,12 +86,16 @@ export const useUpdateQuizMutation = () => {
         encodeURIComponent(moduleName) +
         "/quizzes/" +
         encodeURIComponent(quizName);
+      queryClient.setQueryData(
+        localCourseKeys.quiz(courseName, moduleName, quizName),
+        quiz
+      );
       await axios.put(url, quiz);
     },
     onSuccess: (_, { moduleName, quizName }) => {
-      // queryClient.invalidateQueries({
-      //   queryKey: localCourseKeys.quiz(courseName, moduleName, quizName),
-      // });
+      queryClient.invalidateQueries({
+        queryKey: localCourseKeys.quiz(courseName, moduleName, quizName),
+      });
       // queryClient.invalidateQueries({
       //   queryKey: localCourseKeys.quizNames(courseName, moduleName),
       // });