The GRE is computer-adaptive. The computer adaptive test (CAT)
is more than just a computerized version of a paper and pencil
test. In this format, the computer actually adapts to your
performance as you're taking the test. Understanding how the CAT
works and knowing the test-taking strategies appropriate to this
particular format can have a direct, positive impact on your
score.
When you begin a section on the CAT, the computer assumes you have an average score and gives you a question of medium difficulty. As you get questions correct, the computer gives you more difficult questions, and increases its estimate of your ability. And vice versa, as you get questions incorrect, the computer gives you easier questions, and decreases its estimate of your ability. Your score is based upon an algorithm that calculates your ability level based not just on what you got right and wrong, but also on the difficulty level of the questions you answered.
You have one shot
Because each right or wrong answer directly affects the next
question the test gives you, the CAT does not allow you to go
back to questions you've already answered and double-check your
work. The CAT shows you only one question at a time and does not
allow you to see the next question until you've responded to the
one at hand. So, be as sure as possible that you have answered a
question correctly before moving on. Once you've noted and
confirmed your answer, that's it.
That being said, if you are given a question you cannot
answer, you should guess. Guess intelligently and
strategically—eliminate any wrong answer choices that you can
spot and guess among those remaining. There is a penalty for
every question that you do not answer. If you only have a minute
or two left, and several questions remaining, you should guess at
random rather than leave them unanswered.
