The GMAT is not a test of how smart you are. Nor is it a test of your business acumen or even a predictor of your grades in business school. It’s simply a test of how good you are at taking the GMAT. These simple GMAT tips will help you improve your score.
The GMAT exam is a Computer-Adaptive Test (CAT), meaning it keeps a running tally of your score as it goes, based on the number of questions you get correct and their levels of difficulty. The computer-adaptive sections always begin by giving you a medium question. If you get it correct, the computer gives you a slightly harder question. If you get it wrong, the computer gives you a slightly easier question, and so on.
Beware! Because the test is taken on a computer, you must answer each question
to get to the next one. You can’t count on skipping a question to come back to later as a part of your test-taking strategy. However, as of July 11, 2017, you CAN choose your test section order.
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There are two important factors that can affect your score on the computer-adaptive sections of the test:
If you’re stuck on a question, be a smart guesser and use a process of elimination 
to get rid of some of the wrong answers. Wrong answers are often easier to spot than correct answers. Sometimes they just sound weird. Other times they’re logically impossible. While it is rare to be able to eliminate all four of the incorrect answer choices on the GMAT, you will almost always be able to eliminate at least one of them. You’ll have a better chance of selecting the right one.
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The GMAT is constructed with incorrect answer choices that the test writers 
think you might like. If it’s a mistake a person might easily make on a problem, it’s probably an answer choice. If a question seems easy to you, STOP and reread the question. Make sure you haven’t fallen into a trap.
Because there is a penalty for unanswered questions at the end of the GMAT, it makes sense to guess on any remaining questions rather than to leave them blank. If time is running out, you will almost certainly get a higher score by clicking through and answering any remaining questions at random. This is because the penalty for getting a question wrong diminishes sharply toward the end of each adaptive section (when the computer has already largely decided your score).
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The fourth and sixth tips are extremely important. It pays off wonders in the GMAT exam to go by the process of elimination. And also to attempt ALL of the questions. Skipping even the single last question (due to time constraint) can cause a significant penalty in the score.