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What supplementary books should I buy for my poor math performance in the third year of science in Heilongjiang Province?
Tian Li's books are really good. All kinds of test papers are cost-effective. All kinds of books compiled by myself are very suitable for the college entrance examination. Break through the difficulties of the champion and correct mistakes. ....

There is a separate set of exercise books for reviewing three-dimensional design in the college entrance examination, and there are two small exercises, 1 explanation, 1, which we used last semester.

The whole college entrance examination math is also good.