One great way to study for our quizzes and then for the AP Exam is to use an Exam Prep book. You can check public libraries or, better yet, purchase one of you own so you can highlight and write in it. You can find them at any big bookstore or online at sites like Amazon.com.
You can often buy them used for just a few dollars... a few dollars well spent. You don't necessarily need the newest version since the exam does not change that much from year to year.
You can see some of the options and read reviews written by other students on Amazon.com