How to lock a quiz
Navigate to your CDX Course page and log in to your account. Then, navigate to the course section with the quiz you would like to lock. Then, click on the quiz.
In the Administration box on the right side of the page, find the Quiz Administration folder and click the Edit Settings button. From here, you can set open and close dates for a quiz, place password restrictions on quiz attempts, or “hide” a quiz from student access.