Describe the bug

After the Quiz has been started. I see that you use the Local Storage to store the remaining time. Since that storage can be changed by the user. so someone can extend their time by changing the stored time and refreshing the page and their remaining time gets changed.

Possible Solution: Since the countdown timer is sensitive data. I think maybe it is better to also store the start time in the server or use the server time instead. Don't trust the client.

Step To Reproduce the bug:

1. Start any Quiz.
2. Open Dev Tool (In my case, Chrome Dev Tool).
3. Navigate to the Application Tab.
4. In the Local Storage Topic, change the value of the key timer to anything else.
5. Refresh the page.
6. Countdown timer is changed.
7. After the original time has passed, The test still accepts the answer.

Expected behavior

The changed time shouldn't affect the real quiz countdown timer (The user shouldn't be able to submit the quiz after the real end time is passed).

Screenshots

https://user-images.githubusercontent.com/25188615/142913424-af56ef6f-4d51-49ae-b398-29e15bcb2e1f.mp4

Addtional Context

Also, if you want to store the countdown timer on the client-side, I think storing it in the Session Storage is better than Local Storage since the data stored in Session Storage is automatically cleared after the page session ends while data stored in Local Storage have no expiration.

Sorry if this is a miss understanding or you have fixed this already 🙏

Steps to reproduce

1. Login as a teacher.
2. Try to create a question.
3. Set number of attempt to a negative number.
4. Create the question

Expected Result

It should display an error message.

Actual Result

It allows me to create such question.

Screenshot