I would study from books, if you have the discipline to actually study on a daily basis.
I ordered the Kaplan books from Amazon and went through them that way - Memorized 10 vocab words a day and did 1 section of material in each book for each day (spent about 2-3 hours on GRE/day)... Found them to be very helpful, but I would agree with the user above. All of my Kaplan practice test scores were lower than my actual test day score. I didn't mind it because it motivated me to study harder to actually see improvement on my Kaplan tests, which (I think) also made me do better on the real test.