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The key is to do lots of problems. Toward this, I highly recommend "The Art of Problem Solving" which is packed full of neat insights and interesting problems from math competitions (at an "advanced high school" level).


That looks great, thanks. One of the things that will help me re-learning is that I now have a much better understanding of how maths can help you answer questions and solve problems, rather than just working through rote exercises. I always found that maths made more sense in physics lessons than in some maths lessons.

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