Math SAT 800
This is a concise and well-written book that will help students master the most difficult Math SAT problems. Math SAT 800 has a lot of medium and difficult math questions, so you can skip over all the easy stuff and work on the challenging problems.
This book is divided into 11 sections and it starts with a diagnostic test. The students who are already at the 600-level respond very well to the content of math SAT 800 and improve the most.
Students that start at the 550 level also can improve their score after practicing with this book.
The book contains numerous sample problems in all of the topical areas that the Math SAT tests, and provides a detailed, comprehensive, and easy to understand set of explanations.
You can buy this book at Amazon.com. Although it is somewhat more expensive than the regular SAT math books, it is a great value for what you get.