This book is short-'n-sweet, but IMHO, in the math section, _too_ sweet. If you have a major in anything like math (as I happen to do), physics, electrical engineering, mechanical engineering, or even economics, the way it approaches the math section may seem childish to you (and maybe confuse you rather than illuminate you). I don't know how useful it may appear to (say) English or Psych majors with weak math backgrounds, but it wasn't helpful to me, others than the sample questions, and a couple of nice, time-saver tricks it mentions (3:4:5, 5:12:13 triangles, Bowtie, etc.)

The verbal section is the one I found more useful. For instance, it provides some useful techniques for attacking analogies. However, it is my strong belief that if you are weak in vocab all the nice tricks in the world can't help you much, especially with analogies and antonyms.

Overall, it is not a bad book for its price and its goal (crash course for people w/ only a week in their disposal). However, (1) if you have a strong math background, you may find the math section too condescending and (2) (and most importantly) wait for the new edition of this book, coming out September, that will be updated for the new analytical writing section.

Even if you only have a few weeks to study, I would recommend getting one of the more comprehensive, more up-to-date books. I found the one published by ETS, the organization that creates the test, to be the most helpful, as it has sample essays to look at and questions to practice writing on.

I didn't use this book as a last-minute cram, I read it before starting my study program and it saved me countless hours of trying to figure out strategies for the question types. This method was extremely effective and highly recommended. Finishing the book in an afternoon or two is not difficult.

Final note: You will definitely need a large word list to study and some practice tests. The free GRE powerprep tests are similar to actual GRE questions and are scaled correctly, unlike the Kaplan tests in both respects. I used the GRE Verbal Workout for it's word lists and was not especially satisfied. The book "1000 Most Important Words," while not designed for the GRE, would have been much more thorough and effective, not to mention a third of the price.

Good luck!