I would also caution taking a course for credit at a young age and not enrolled in college full-time, especially if someone is planning to attend graduate or medical school someday. I started taking courses quite young before my district stopped allowing me to take them. However, the college at which I finished did accept the credits and put them on my transcript. To make a long story short, some of my "low" grades (A- and B+) came back to haunt me during medical school interviews, as interviewers first assumed that I had dropped out of college and then degraded me for taking physics and chemistry courses while I was a pre-teen.
