Let me answer your question. You can find a better tutor to solve the problem. If you don't know math, you actually have no mathematical thinking. You didn't lay a good foundation in mathematics before, which led to a tired and hostile attitude towards mathematics. It won't help much if you let him attend a training class. You'd better find a teacher to diagnose and train him on the short board. As long as he has a foundation in mathematics, he will have confidence, so there will be no problem in his future study. I hope I can help you.