I haven't done the exam, but here are links that may help you out.

Graduate Record Examination - Wikipedia, the free encyclopedia
How to Prepare for the GRE: Tips for Preparing for the GRE Graduate Schools Standardized Exams
How should I prepare for GRE and admissions?
GRE Test Preparation Practice Exercises for Verbal, Antonyms, Analogies with Explanations, Analytical Writing, Quantitative - Free Online