Ditto on the books, they'll help you be prepared. You won't learn anything from them but they will prepare your mind and give you a good idea of what to expect, which is good since the test is timed.

Another bit of advice is to do the best you can on ALL parts of the test, not just the pilot parts. I've heard of people only making an effort on the parts of the test that apply to the career field they're looking to go into, but I can tell you if you score well on all 5 parts, it will get attention.