These days coincided with the end of the senior high school entrance examination, and I saw many similar topics. Here are some classic competition books.

Introduction: Uncle Huang Dongpo's new thinking training contest is very suitable for beginners, and the latter is more difficult.

Improvements: the comprehensive volume of junior high school mathematics competition course (the answer of this book is basically "abbreviated"), the extrapolation of typical questions of Olympic mathematics, the ABC volume of Olympic deep-water bomb (note that this is not a paper, but a book), and the Olympic deep-water bomb also has some merits.

Difficulty category of rematch: Geometry, combination, number theory and algebra in the Olympic Classic are all comprehensive, but most of the questions are not difficult (be careful, don't buy the high school version). From Classroom to Olympic Mathematics (edited by Zhu Huawei) is very brain-trained, especially the three-star questions in it, most of which have original opinions.

Ultimate (much more difficult than the semi-finals): The junior high school papers in the Olympic Mathematics series are one set, and most of the questions are too difficult, so you can skip them appropriately. The problem-solving problems in junior high school mathematics competitions are precise and few, but they are extremely difficult. If you eat half of these two books, I guarantee that you can enter the top three in the city.

Finally, I recommend some real questions, such as "all real questions"

As for the time to learn the competition, the sooner the better, but I didn't start learning the Olympic Mathematics until the second semester of Grade Two, and I didn't have any foundation before. I came back from the third grade and won the first prize, which is the second in our school. PS: There are no competition classes in our school. We rely entirely on self-study, too much homework, and the conditions are far worse than those of our competitors in No.1 Middle School. So if someone brags that it's too late for you to learn the game now, just ignore him. Play with your hands completely,