TheHillCrew,
When are you taking the GRE?
I had 3-4 months to study, and used 4 books - princeton, kaplan, barron's, and GRE for dummies. I didn't purchase one of those books, just borrowed from friends/library. Each had a CD with practice tests, which were all slightly different in content, but kaplan had a nicely structured study program, breaking down each section of the test into separate activities. Plus, kaplan has a timeline, and other tips as well.
To pick one book, I'd say kaplan, but you might be able to find it, or other GRE prep books at your library. Just something to check out.
The kaplan "hit parade" is helpful for daily vocab practice, and the math is broken down into helpful strategies.
Oh yeah, princeton review has a nice website with practice tests and feedback available online.
What helped me the most was taking those practice tests, including the GRE software on the ETS website (makers of the test). My scores started low, 900, then jumped up to the 1300 range consistently. In the end, my first, and only attempt resulted in a 1200.
Also, practice those essays, TIMED. I was out of practice writing anything, and should have devoted more time preparing for that section (called analytical). It was challenging in the limited time available. Got a 4, so not too great.
Hope this helps.
Good luck to you,
J