What is the difference between a Matric Rewrite and a Matric Repeat?

A Matric Rewrite is for retaking only the NSC subjects you want to improve. You study online at your own pace and write DBE exams in May and June. A Matric Repeat is the full Grade 12 year again: all seven subjects, live academic sessions and SACAI final exams in October and November. Both are for learners under 21.