I scored 170, studied about 5 months, 40 to 100 questions a day, by the following material.
5 lb. - solved all 1100 questions 4 times. On the 3rd and 4th time I was able to complete the book in 12 days. After this, I mastered all kind of quentions and discovered the fastest way to answer a question.
Kaplan - there are 6 practice tests on-line available for those who buy the book, but there is a way to have it for free. Google it.
Magoosh - I solved the set of 640 questions twice.
ETS official materials - I found on internet 2 official guides, with 3 practice tests and some questions. Take it. Also, take the Powerprep II by ETS.
As I said, I used to solve 40 to 100 questions a day, nothing more than 1 hour a day, and scored a perfect score. Be ready to take the test at least 2 months before the deadline, you may fail on your first try. I used to score 168, 169 and 170 in practice tests, includind those of kaplan, which are much harder than the real test, and scored 163 on my first try. I was extreamly nervous. 21 days after, I scored 170 without a single hour of study, and I was still able to submit my scores before the deadlines.