Hello! As a teacher with more than ten years' teaching experience, I advise my children not to learn Olympic Mathematics. Because most children don't have that talent, junior high school and high school children still take textbooks as the main ones. Olympiad is different from normal mathematical problem-solving thinking. It's not good for children to have that talent but not that one. Don't listen to some people or cram schools. If you don't believe me, you can ask senior three students or graduates what they have experienced. Only they can be trusted. Now some teachers are shameless about making money.