Instruct: Classify Amazon reviews into positive or negative sentiment
Query: You just can't go wrong!

I'm not going to mince words. The most important factor to doing well on the AP US History test is fact recall. That is, cram as much information into your head as you can so you can go back and regurgitate it when you take the exam. This book is incredibly detailed, but there's no "useless" information. The more of it that sticks in your head the better that you'll do on the exam (and believe me, there's so much in here that you'll remember SOMETHING). The questions are a level harder than they are on the real deal but that's how you should be preparing anyway. If you buy it to use during the school year as a supplement to your textbook, you'll definitely get the most out of it. However, even if you buy it like 2 weeks before the test (like what I did) it will still do a great job in helping you prepare. My only "complaint" with the book is that I should have bought it earlier.