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Revise as you study along, revise often
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Do a lot of past papers under timed conditions
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Understand what the examiner is asking for and try to tailor your answer to their requirements
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Learn from people smarter than you
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Go through the specifications and learn the material ahead of time; being a topic or 2 ahead of where the class is at gives you more opportunity to revise
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If necessary, get a tutor
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Learn from your mistakes - if you aren't, you're not learning properly
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Look up active recall, Feynman technique, how to learn maths
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Most people spend time working hard, you want to work hard and smart (the latter would mean you get to spend less time working hard but getting the same result)