Yeah, I’m skeptical about the benefits of skipping lots of grades. If you have money to throw around, hire private tutors to teach them more advanced subjects and let them enjoy the social aspects of school with their peers. Otherwise, what’s the best outcome? The kid spends their entire school years socially isolated from peers who are in different stages of puberty and growth. They enter college at 14/15 and risk missing a lot of what college has to offer besides education. Then, finally, they enter the wage machine at 18-19, having lost a lot of their childhood and now having to behave like adults. Everything may work out and they’ll retire at 40 to live the life they missed, or they may be socially and psychologically scarred by the pressure put on them by others and by themselves throughout their life.