A- Level Maths Tips? How do you stop making silly mistakes in A-Level Maths?

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forwards - guestimate the answer and check yours roughly matches

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backwards - sub your answer back into the original "equation" and check it satisfies it

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read questions carefully and underline stuff / sketch the basic problem as a way of making sure youre starting in the right place

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reflect on the mistakes you make and try and understand why you madethemt. If you make a mistake do the question (or a few similar ones) in a week or so

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do some regular practice on topics youve previously covered, so use something like dr frost to compile and chug through the questions

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practice on harder questions than you might expect in the tests