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Ask for a junior high school math reference book
I think the best science tutorial book is Divergent Thinking, which seems to be called Big Classroom. The cover is Einstein's face. . . The questions in this book are well arranged. I attach great importance to the cultivation of thinking and the leap of thinking, and it is the best counseling book I have ever used. . .

Mathematics is the most important thing, just understand the examples and definitions thoroughly. . .