The Boy was very pleased to discover he’d received a “B” in his first college course. I’m–well, I come from a family where “A"s were expected, and barely noted, but I was pleased because there was a lot of work and pressure associated with this grade. He went from keeping his own schedule and deadlines to keeping someone else’s very quickly.
And what’s more, he learned stuff. He can talk about movies now in a fairly erudite fashion. I often found more than a bit of disconnect between classes I learned from and classes I got "A"s in.
Anyway, I learned stuff, too, about what he needs work on. And, not surprising, it’s just more reading and writing. That’s what education used to be, mostly: reading and writing. And, mostly we’re talking form and style, with a few grammatical/punctuation issues. The content of what he wrote was pretty damn good. (He wrote a "memoir” of himself from the perspective of his shoes. Funny guy.)
Homeschooling or not, exposing your kid to a college class ahead of time is probably a good idea. Recommended.