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Too much content = simplify notes into e.g., spider diagrams/flashcards. When you memorise the basic key concepts, then you can start to remember specifics. Also look at your exam specification overview to make sure you're only learning content within that.
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Memory techniques = you could do blurting or use the Feyman method
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If you struggle to memorise because you don't fully understand the concepts, YouTube summary videos are really useful (I watched Miss Estruch's channel) to take notes from
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Past papers/questions = I would recommend leaving these until you have fully understood a topic or 1/2 weeks before you have a test/mocks.
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Rewriting notes is mostly known for its ineffectiveness but it actually helped me - my college gave me topic booklets but I learned better by rewriting the information into my own words, removing unnecessary content and adding more info when I didn't understand something. This saved time when revising.
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(Another note: If your exams include an essay, learning how certain topics are applied in a real-life context may help you memorise how they work).