NO!! Your post was very misleading and I misunderstood

I thought the other 3 kids were in the same 天才班 as your son. Then you explained that those 3 were not in the 天才班.

I was responding to your statement that someone is 天才班 must be normal. I was not paticulily saying you should be worried. But if you son is not happy with the situation, talk to the teacher. I would if I were you.