I am a professional SAT/GRE teacher and tutor, achieving an 800 in the GRE math section. After telling many students that the secret to the math section is mental math and approximation, I decided to see what books were available. I saw that this one had good reviews and ever since then I have been bringing the book to all my classes and tutoring sessions. I recommend this book for those who never felt they got the hang of math as well as people who love it like I do. It is clearly written, very encouraging and has lots of drills.<br>I love this book and I think that it really will help people feel more confident when they take a test or just are trying to figure the tip.