Is it better for a fifth-grade child to learn Olympic Mathematics for the first time or to enter a training class?
At present, it is mandatory in the whole country that you don't get extra points in the Olympic Games. Therefore, the purpose of learning Olympic Mathematics can only be to be interested in children or to expand their thinking ability. So, that is, self-study, let him broaden his thinking ability. If he can't get in touch, give up. After all, not everyone can contact Orsay.