I'm guessing what she is actually aiming for in some deluded misguided thought, to some extent, is to remove and replace learners from schools that are predominantly white with more black students. Logically though, what she is going to achieve is that in order to get a 50/50 balance there should be less black students being educated purely because of how skewered the general black/white population distribution is. So effectively the anc just converted their 30% pass rate to a 0% for a fair number of students.
Side note, we would have far less racial issues if people stopped talking about everything based on racial lines. The anc here is just perpetuating [more] issues based on race.