Hello @chrisrockwell ...
You do not enroll students in a quiz. Rather, you enroll students in a course, and then they can access content within the course...including quizzes. However, an instructor can choose to hide course navigation menu options such as "Quizzes" and "Assignments" from students so they would never see those buttons in the course to be able to access content within those pages. I mention "Assignments" here, too, because many times quizzes are graded...and they are also considered assignments. Here is a Guide that shows how an instructor can hide course navigation menu items: How do I manage Course Navigation links?.
I hope this will help a bit. Sing out if you have any other questions about this...thanks! Take care, stay safe, and be well.
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