1. If the child is in primary school now, the basic problems are well done and there is no problem in calculation, and simple application problems can be worked out. Math is not good because complex application problems can't be done, and simple calculations and additional problems can't be done well. I think it can be reported, because the olympiad itself is a progress in mathematics. It is very helpful to solve problems with multiple words and thinking, which is helpful to do simple calculations and expand thinking. For example, if you have studied the Olympic Mathematics, you will understand it well and you can simply work it out. If you haven't studied it, you will have to use equations to solve it. The child's level has not yet reached.
2. If your child goes to junior high school, I suggest that you don't have to study, because if you study junior high school Olympiad directly, your math performance will be poor, which will add extra burden to your child. If you let primary school learn Olympic Mathematics, it will not be of great help to junior high school. There are many subjects in junior high school, so it is a waste of time to be distracted.
3. If the child goes to primary school and the foundation is not solid, my suggestion is not to learn. Telling the truth, the olympiad is more difficult and requires higher intelligence and talent. If children want to improve their grades by studying Olympic Mathematics, they must first learn the basic knowledge and pass the calculation ability. The knowledge of primary school is relatively simple, and the scores of additional questions are relatively low. If children are not interested in mathematics, they should focus on the knowledge in textbooks.
Poor math is related to talent and heredity. You can try to start with the elementary school olympiad to see the children's acceptance. It's a bit risky to report directly to the Olympic math class. You can buy some elementary books on Olympic Mathematics and let him see if he can accept it before making a decision.