A review manual is an excellent way to go….but if you spend time on these sites you can get a great review as well.

Learnerator
https://www.learnerator.com/ap-us-government-politics

Global Post – How to Prepare for the US Govt and Politics Exam
http://everydaylife.globalpost.com/prepare-united-states-government-politics-ap-exam-28527.html

College Board
https://apstudent.collegeboard.org/apcourse/ap-united-states-government-and-politics/exam-practice

AP Central
http://apcentral.collegeboard.com/apc/public/courses/teachers_corner/2259.html

C-SPAN video reviews
http://www.c-span.org/video/?312690-5/high-school-us-government-exam

Acorn Book – Overview of the course and the test
https://secure-media.collegeboard.org/digitalServices/pdf/ap/ap-us-government-and-politics-course-description.pdf

87 Critical AP Govt Concepts
https://quizlet.com/23110310/87-critical-concepts-in-ap-government-flash-cards/