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Continue to take practice exams. Treat each one as though it's an official test - time yourself, isolate yourself in a quiet area, have a calculator and extra pencils at the ready, etc.
Also, many people find it beneficial to practice quickly skimming passages for important bits of information. This helps immensely on the science section - get used to interpreting graphs without the full context if you want to be able to answer every question within the allotted amount of time.
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