<p>It might also help to go through whatever past AP Lit exams they have up on College Board. One of the free response essays is always about a book you get to choose given a certain prompt. The prompts are always accompanied by a list of suggested books. It might help to gather a list of such books and see which ones show up the most often. (And, obviously, if they’re on the list, then they’re “AP level.”)</p>