Safe to Use Old Edition of AP U.S. Gov. Book?

Government in America: People, Politics, and Policy is the book in question. I figured that politics might be a book where you need current events, but I’m not too sure. Any test takers out there willing to voice an opinion?</p>

well it depends how old. if its before the obama administration it might be a problem because the most recent one references it. but what really matters is the barrons or cliff book cause those are the ones that you actually use to learn; that and your teacher</p>