Whether it means attending a class twice a week or picking up a review book at the library, you'll want some help in studying for the GRE. Experts suggest starting preparation anywhere from 4 to 12 weeks before the exam so that you can master the material without forgetting anything [source: The Princeton Review]. If you're looking for courses or tutoring, test prep companies such as Kaplan and Princeton Review offer a range of services both online and through in-person classes across the country. For more independent study, these companies also publish comprehensive study guides, many of which contain testing software that simulates the computer-adaptive testing used on the GRE.
Whatever study program you choose, you need to be sure that it will properly prepare you for the conditions of the exam. For example, practicing with pencil and paper will only help so much if you're going to be taking a computer-based exam.
Another source of practice questions is ETS's Powerprep Software, which is available on the official GRE Web site. The software is free, and it is made by the same company that develops the GRE. The software has only two full practice exams, however, so you may want to take one at the beginning of your study regimen and the other toward the end in order to measure your progress.