Gcse chemistry combined science higher triogy

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Either make notes or use preprepared ones (like PMT) - whichever you prefer

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I tend to make flashcards on key terms and formulae

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Blurting is my fave technique to see how much you remember. Take a topic and split it into mini subtopics. Randomly pick one of these and 'blurt' everything you can remember onto the paper on this subtopic. You then check your notes and see what you forgot and write that out in a different colour pen. Depending on the pen colour ratio and just how you feel on the topic, give it a rating out of 5 for confidence. I usually recall again if it's below 3, and may do it a couple of times if it's 2 or below. Every time you repeat give yourself a new score and use this same reasoning and soon enough your scores go higher and you can remember the majority of your notes.

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Then I'd do practice questions. Can be full papers or just topic specific ones. As you've been told this is the best way of revising.