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Classified essential mathematics 20 15 answer
You can use Leoliu's English reference books (some of which have no answers), the classic classification essence of physics can be used, and buying a list of junior high school chemistry knowledge in chemistry can be regarded as explanation+review. If you focus on doing problems, you can buy 38 sets (which is the senior high school entrance examination). If you are from China, buy a book about ancient Chinese, read it and understand it.