This book was great for a review on all the major topics covered on the GMAT test. Gives you a brief tutoring on the topic and then pleanty of practice problems covering what they just talked about. Most other review products that I have seen out there don't give you that many (or give you far too few to none at all) practice problems on the topic or covered. Most give you a test question and then cover the answer, nothing more. If you are like me you want a review of it all. You get a good review and practice with the Math Builder. VERY GOOD!!!!! Thanks REA!!!!!