The GMAT consists of four main sections—Analytical Writing Assessment, Integrated Reasoning, Quantitative, and Verbal. You have three and a half hours in which to take the exam, but plan for a total time of approximately four hours to include optional breaks.
The GMAT adjusts to your individual ability level, which both shortens the time it takes to complete the exam and establishes a higher level of accuracy than a fixed test. At the start of each multiple-choice section of the exam, you are presented with a question of medium difficulty. As you answer each question, the computer scores your answer and uses it—as well as your responses to any preceding questions—to determine which question to present next. Correct responses typically prompt questions of increased difficulty. Incorrect responses generally result in questions of lesser difficulty.

This process will continue until you complete the section, at which point the computer will have an accurate assessment of your ability level in that subject area. In a computer-adaptive test, only one question at a time is presented. Because the computer scores each question before selecting the next one, you may not skip, return to, or change your responses to previous questions.