GMAT CAT
The GMAT is a computerized test that adapts to your performance. This format is called a CAT (computer-adaptive test). As you take the test, the computer selects questions based on your performance. If you get a question correct, the test selects a more difficult one next. If you get a question wrong, the computer selects an easier one next. Thus, the test adapts to your performance.
Your very first click to question number 1 on the GMAT test determines what your second question will be. The person who answers it correctly will get a more difficult second question than the person who answers the 1st question incorrectly. Each right or wrong response determines the difficulty level of your subsequent question.
Guess the correct answer
Because each answer directly affects the next question, the CAT does not allow you to go back to questions you've already answered. On the GMAT CAT, you see only one question at a time. You won't see the next question until you've provided an answer to the one in front of you. Once you've confirmed your answer, that's it.
Since you can't revisit previous questions, if you don't know an answer, guess. But since there is a penalty for each unanswered question, it's even better to guess randomly than leave a question unanswered.
Harder questions score more
A result of the CAT format is that the harder problems count more than easier ones. If one student does twenty easy questions, half of which he gets right and half of which he gets wrong, and then another student does twenty very difficult questions, half of which he gets right and half of which he gets wrong, the second student who did the very difficult questions will get a higher score.
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