You need to create an individual MyAccess account in Access Medicine in order to get to any self-assessment questions. See these instructions for setting up a MyAccess account.
From the Library website, click on Access Medicine under Books on the left side of the page:
Click on "Study Tools" and "Review Questions" in the gray bar across the top of the page:
Then click on the book/subject you need:
You will then sign in to your MyAccess account:
Enter the number of questions you want from each chapter and click "Start Quiz" at the top of the page: