Below is a walkthrough on how you can reset a quiz for a student. After resetting the quiz the student can navigate back to the quiz that has been reset and take it again.
From your section page click on the student that you would like to reset the quiz for.
Note: you can also access student quizzes from the Activity Progress and Quiz scores pages.
From the student’s user page, find the quiz you would like to reset.
Once you click on the quiz you will be taken to the quiz page. Click on the reset quiz button, and follow the instructions. Once reset the student will be able to access and retake the quiz.