Here I’ve listed some best study guides for GRE preparation:

The Princeton Review GRE study guides:
Cracking the GRE, 2007 Edition
Cracking the GRE, 2008 Edition
Cracking the GRE with DVD, 2008

Kaplan GRE study guides:
Kaplan GRE Exam Verbal Workbook
Kaplan GRE Math Workbook
Kaplan GRE Exam 2007-2008 Premier Program

ETS GRE study guide:
Practicing to Take the General Test 10th Edition

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