The quizzes and tests are limited to 6 attempts. The fastest way to complete the class is to pay careful attention to the course material before the quiz so you can pass it on the first attempt. Sometimes with little time, etc., it is tempting to rush through it but that takes more time.
Also, the course manual is available and because it's a .pdf if it's searchable to quickly look up topics you need to review.
(Use Control F or EDIT FIND).
I can reset it for you now and good luck as you continue.
Thanks,