Resit all???

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Look through the exam papers and see where you went wrong - no point in resitting for a repeat result

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Learn from those mistakes and find strategies to alleviate those mistakes - was it an exam performance issue, didn't understood the material, wrong approach, etc.?

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Get advice on how to study your A Levels well (see below for videos)

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Do past papers under timed conditions, then review where you mistakes were; compare this with the mark scheme and see where are your weakest areas. Revise on the weak areas, learn from your mistakes, and then redo the question.

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Study in a study group if necessary, learning from the students who did better than you ideally.

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If your study material isn't enough, consider getting a tutor.