> When I want my child to really excel in learning, I would force them into kumon - so they can skip a grade

Great - so now they're a year younger than all their peers in terms of emotional resilience. I've seen this play out time and time again, and it is disastrous for them and their ability to build relationships.

Pushing children ripe is never a good idea. If they're ahead of their peers, find other outlets for their intelligence. Teach them new skills, involve them in new hobbies. They need time to grow; education is a journey, not a race.