Berkeley Middle College in South Carolina? Does the link below help?
In my area (northern CA) a middle college is a community college that offers courses that can be used to complete the requirements of high school. Kids in the "middle college" program are attending one of the local community colleges and taking all of their classes - typically only their senior year - there. Students must work with the public school guidance counselors to create a plan of study that will satisfy all of the requirements.
I recommend that you take this question to your guidance counselor. He or she is probably best qualified to give you a precise answer.