You need to find an AP Exam Review Book you can borrow or purchase. I strongly recommend buying one so you can write in it and have it as a quick reference guide for when you take upper level psych classes in college. The Chicago Public Library has some copies, but you better get there right away. You can also purchase them at bookstores like Barns and Noble or online on Amazon.com.
You don't need this year's version... if you buy a used one from last year they are practically free.
I recommend either "Barron's" or "5 steps to a 5." I'm sure books from Kaplan and the Princeton Review are also good. The main idea is to review each chapter and go over any topics you need to work on.
All books have a diagnostic test which will tell you what areas you need to work on.