AP government

Hi! Whats the difference between comp gov and us gov AP exams?

Comparative government and politics deals with 6 core countries; Britain, Russia, Nigeria, Iran, Mexico, China. US politics deals with the US. You can read more here, https://apstudent.collegeboard.org/apcourse

which book is suggested for US gov?

Thanks, by the way

Princeton review is overall a great test prep book, but other good books include Barrons and 5 Steps to a 5

Yep, obviously. I am asking which one is the best for this exam.