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What textbook should I use for self-study of Olympic Mathematics in Grade Two?
Of course, if you learn it, you may win a prize. If you want to be shallow, you can buy the math Exploration and Application of New Ideas, which is also Su Dongpo's. Better than "excellent training", it is an upgraded version. It's too simple to draw inferences.

At a deeper level, buy a problem-solving manual for junior high school math competition and a course for junior high school math competition. These two books are complementary, written by Ding Baorong. They are hard and good. They are all competition questions over the years. Of course, there is the Hope Cup, but it's really hard. I'm big. . . .