There was a kid who graduated from h.s. at about 12 and started at CU. Even with his reduced schedule, he found out like many ‘normal’ college kids do that college was not high school. I’m not sure it was any one class he couldn’t handle but the way all the classes fit together, the group projects, the pace. He was exhausted (he lived 30 minutes or so from Boulder). He slowed down and adjusted some activities. He still had friends from grade school and social activities typical to an early teen. They did a follow up when he was about 22 and he was finishing his initial degrees and working on a masters or doctorate, and doing fine, but he was no longer 5 years ahead of his peers. He was still very very bright compared to both his same aged peers and his classmates, but he was closer in maturity, social levels, interests with both groups.
I don’t think there was anything else his mother could have done to make school smoother for him. He had to have his own path.