I, of course, forgot just to put that going to college while in high school is dual enrollment (thanks to someone for reminding me).
Depending on how many classes your child takes and when they start, they can almost finish the 15 or so GE lower division requirement classes for a 4 yr degree (at least that’s how it is working out for our kids here in CA). For example; our one daughter will have her AA degree and almost all her GEs finished by the time she graduates from high school. She started college at 14.