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Know math formulas before you take the GMAT because the test doesn't provide them for you.
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Remember that easy questions are worth the same number of points as hard questions, so don't rush through the easy questions and make careless mistakes.
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Eliminate answer choices that don't make sense.
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Memorize the chart for answering data sufficiency questions. As soon as you've determined whether a statement has enough information to answer the question, eliminate answer choices and move on. Don't waste time solving the problem unless you have to do so to make your determination.
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Take advantage of your noteboard. Use it to draw pictures, work out formulas, and cross out wrong answer choices.