S.C. Code Ann. § 59-49-115: Diplomas.

The students enrolled in the school who earn a total of twenty-four units of credit distributed as specified in the Defined Minimum Program for South Carolina school districts and who meet the school's requirements for graduation are eligible to receive a state high school diploma. The board, in its discretion, may issue its own high school diploma for students that exceed the state requirements for a high school diploma.