content: I bought this book as a first step to preparing for the ASTB. This book is so full of mistakes, from BASIC math to the spacial apperception portion, that I was upset I spent any money on it. Certain sections left me more confused than when i started due to so many mistakes. The author should be ashamed to publish something with so many obvious errors. My first clue should have been the fact that the author 'retired' from the Air Force as a 1LT.