I used the book for two months before the test. This and the practice tests were all I did. Helped me recall lots of concepts from high school and I was able to scored above 700. Not that getting this book with guarantee that, you do have to be smart and know quite a bit about math and language. For somebody who did well in school and is looking to refresh ideas, this book is well worth the cost. Do not let the talk about not being able to get 700 with this book fool you, if you're smart you will be able to.