I only had about 2 weeks to study for the GRE, unfortunately. However, I used Kaplan's online resources which gave me access to 7 practice exams and the quiz bank. I can't even say enough about that quiz bank. You can select types of questions you are struggling with and create timed tests based on your weaknesses. They give you an initial assessment to see how you would do if you took the test cold (they estimated me at 149V, 146Q, 4AW). After only two weeks of practice using Kaplan's stuff, my dumb a** ended up with 161V, 153Q, 5AW... for real. I swear I don't work for them but if that's not a testament to a good product, nothing is!