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This is a good book with basically everything you need to get that "perfect" score. However, in the interest of preserving your sanity please do yourself a favor and buy it at least three months prior to taking the test. This will allow you time to go through each lesson in order and review the practice tests. I used this a week before test day... I am thankful I know my math well, but... it's no way to live. I am currently retaking the test in an effort to raise my scores. That being said, it helped me a lot to refresh and I believe I gained at least 50 points because of that. It is definitely worth the money and the time to review it.