I read the
PR book, which may have helped refresh some things, but i don't remember seeing almost anything from it on the test. I'm a great history student, but took the test @ end of junior year, having taken honors WH in 9th. There were so many questions I wasn't positive on, and a few that I had absolutely no clue. I thought I would get like 650 because I felt lost on a handful of the questions, but I was VERY happy to see a 750

.
I guess it has a decent curve (assuming that I didn't get super lucky). For one, def. get the CB books that have official practice tests. Seeing that
PR didn't help in review that much, i'd say practice tests are the best.