hey there..
i got a combined score of 1500...here's what i did
1) did the kaplan book and CD(very very good) esp. the tests...in the CD repeat the full tests after you've done them once...new questions often appear
2) the princeton review...although its very well written and has useful tips on how to go abt the gre, the level of questions in the book or CD is not very high...so do it first to get a grip on things
3)barron's wordlist....do the entire list
4) one more thing i did was read some good articles at news websites...invariably you'll come across 'gre' words...