Do some review on the math portion. I took the GRE and only missed one of the math questions. It's really basic stuff, but you'll want to know your triangle identities, etc. The Kaplan book is quite good. More importantly, get the Kaplan book with all of the words and spend months learning all of the words so you can go well on the verbal portion. I didn't do this and didn't do as well on the verbal section as I possibly could have.