Taking the test in 2008?
The most convenient way to register is online at mba.com. You may also register by phone (1-800-717-GMAT) or by mail (Pearson VUE, Attention: GMAT Program, P.O. Box 581907, Minneapolis, MN, 55458).
The cost to take the exam—or "appointment fee" is currently $250. The Graduate Management Admissions Council (GMAC) takes most major credit cards, personal checks, and money orders.
To retake the exam, simply follow the same procedures. However, keep in mind that you are not allowed to take the GMAT more than once in any 31-day period.