I just took the test last week, and found the free online tests through ETS and this book to be very useful in teaching me what kind of questions would be on the GRE. The new version is definitely different, and more difficult, than the old one. I particularly like the explanations of the questions that go through each possible choice following the practice sections. If you have no memory of high school maths, like me, you might also need to buy a book to remind you of the basics of geometry, statistics and algebra. The explanations in this book will sometimes assume such basic knowledge.