So a buddy of mine gave me three Kaplan books for free. They say "Step 1 review: General principles" and Step 1 review: Organ systems"... and there is a book called Q-book. The date on them says kaplan 2002. Are these books any good? I'll be taking the test in 2006, so is there going to be a difference in material from the 4 years? Any advice is appreciated. Thanks.