It's got everything you need to know, and my scores did increase.

This book helped me achieve a higher score after I went through half the workbook. I increased my math score from a 610 to 700 in 3 weeks. This book does do wonders. However, some of the explainations of the problems and how to work them are vauge and really don't give you a sense on how to apply them to other problems with the same underlying concept. In conjunction with this book, I would have to recommend Kaplan's SAT 1600 and Kaplan's SAT II Math IC for mastery of harder questions and for more review.

This book contains very good practice material but the explanations to the answer choices are very vague and difficult to understand.

I would definately recommend that you buy this book. The practice that it gave me was extremely helpful, as well as the "SAT Math in a Nutshell" section. The format was easy to follow and true to the SAT, giving me plenty of practice, and help where I needed it. It improved my math SAT score 50 points - from 630 to 680. And I only did about half of the book! Imagine if I had worked through the whole thing. It's not hard, however - the book is designed so that you only tackle one (approximately) 30-minute section at a time. Just remember - for best results, make sure that you start using this book 3 weeks to a month ahead of time.

The verbal workbook helped me even more, raising my score 100 points, from 660 to 760.

Kaplan's math workbook is definately worthwhile. It WILL improve your scores!

If you are familiar with the SAT's already, I guess it would work well with you. It provides alot of drill practices, and I believe that after completing the book it does work. I did pretty well on the math section.