I know this best. I said: You buy about 22 copies of Black Mathematics published by Zhejiang University. The donor and the editor-in-chief of Ma Maonian are very good. If the math is average, buy blue math (the course of Olympic Mathematics) with the cover of the earth. If it doesn't work, buy (optimize the design) this book, which I bought in senior one physics. I feel that the topic is not bad. Don't listen to them: (Shuangsu) buying Chinese is good, but math is so hairy, (teaching material analysis) is so hairy, the topic is not novel, and the examples in that book are not novel, but they are all recent mid-term exam questions, so it is not good for anyone to do a few mid-term exam questions in the whole book. When I was in junior high school, I should have read many reference books bought by teachers and asked some reference books from famous schools. I think it is really difficult to buy math reference books if you don't get good grades. If you don't study well, I mind hiring a tutor. Listen carefully in class if you have no money, and don't buy those irresponsible math. Mathematics needs inspiration and wisdom, unlike Chinese and English. Buy if you want (the textbook of junior high school mathematics competition in the new curriculum standard) (the course of Olympic Mathematics) (the sprint of junior high school Olympic Mathematics competition).