Self Study AP US Gov't and AP Comp. Gov't

I am looking to complete both AP US Government and Politics and AP Comparative Government and Politics on my own and any advice on study methods, textbooks, or accounts of past experience would be appreciated.</p>

Thank you!</p>

The best textbook is Government in America by Edwards, Wattenberg, and Lineberry. The best prep book is Crash Course. Reports by CCers indicate that Crash Course totally dominated the exam.</p>

Is it ok to take the AP Test without taking the class?</p>