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One of the best tips I got for how to manage my time in the GMAT was that I should use the interstitial time, between sections, to write down anything I needed to remember for that section.
For example I used the initial 5 minutes of tutorial to write down the structure and main keywords I should use in the writing assessment. I also wrote down all the math formulas I was afraid I would forget.
This helped me jump into my quant section without fear or panic that I would suddenly forget how to calculate compounded interest rates, or the area of a trapeze.