This is a real estate blog.
Why don't you call the school district main office for general information and ask them who offers G.E.D. classes. Most school districts do. If you are from that area, you should know how to find the listing in the white pages for the county the school district is in. The yellow pages don't carry enough information.
Sometimes you can call the local public library if it is large enough to ask their information librarian about the same thing as she'd most be likely know and be from that area.
Most schools have websites that end in k12.sc.us For instance, if you were interested in Dorchester County near Charleston, it would be listed as dorchestercountypublicschools.k12.sc.us
I do hope you go for your G.E.D.; you will never be sorry for pursuing that direction in your life and go on to college. The county I just looked up is Beaufort. I can't be positive, but the website may be this:
beaufortcountypublicschooldistrict.k12.sc.us It's worth a try.