I think this is the single most comprehensive SAT study book I've come across. I have Princeton Review and College Board's SAT books, too, but this is much more helpful. I've seen Kaplan's study books, too, but the Kaplan SAT book with 12 practice test is the only other book worth getting. By itself, the Gruber's SAT book has tons of practice problems and useful strategies for doing well on the SAT. I love the way the book is organized and the way the material is presented. I think this book by itself will guarantee a higher SAT grade, if you do the work (meaning, do the practice problems, follow the strategies, and take the practice tests).