Released FRQ questions from the past ten years (and the answers to them!) on the College Board website:
http://www.collegeboard.com/student/testing/ap/usgov/samp.html?usgovpol
Still have questions about specific topics? Try this website (it's a while AP Gov course created by the University of California):
http://www.ucopenaccess.org/course/view.php?id=81
If you'd prefer to learn/review by watching videos, try Hippocampus:
http://government.hippocampus.org/
Here's a site with close to 300 digital flashcards you can use to review for the exam:
http://quizlet.com/2227445/ap-government-exam-flash-cards/
If you find other good sites, send me an e-mail with a link and I'll post it here.
-Micah
