Know your Official Guide - The Official Guide is the primary source of actual GMAT questions. The questions one sees in the OG are retired official GMAT questions, i.e., questions that have appeared on the GMAT before but are not currently in circulation.
Get to know the exam - Explore the Interactive Tutorial to get a feel for the exam itself. Use the GMAT Official Guide Series to learn the exam’s sections, pinpoint weak areas, and create custom practice sets.