I absolutely hated high school and the community college classes were like heaven to me. I started at 16 and made friends who were a year or two older than me. Some of the high school seniors from my high school took classes as well. These were supplements or replacements for kids who were going to finish high school. I started full time right away. If I remember correctly I had to take one math class that was non credit since I had not completed trig yet but other than that I was in college. I had some other issues going on - family stuff - and did not end up finishing college any earlier than if I had stayed in high school but I did very easily transfer to an excellent four year university and then on to graduate school. I think the rule was that once you had at least 30 college credits you could apply to a four year college without a high school transcript. I never got a high school diploma...and it never mattered.