1, Olympiad is just an interest and an extension of mathematics. It has nothing to do with the commonly used exam-oriented mathematics. If you want to improve your brain's reaction ability, or have great interest in solving math problems, you can try it. This kind of cross-sectional study of mathematics has little intersection with step-by-step examination-oriented mathematics, which should not be of much help to improve your math scores.
At school, teachers often let students with excellent grades share their experiences with their parents. And these are all worth learning from the parents of other children.
However, learning from others does not mean blindly imitating others. Moreover, it depends on whether the learning method is suitable for their children, which requires parents to communicate with their children, let them choose the learning method that suits them, and then parents can improve it, so as to formulate the learning method that suits their children.
In short, interest is the best teacher. If a child has a strong interest in mathematics and enjoys it, then his math performance will not be too bad.