It's interesting.

 The Afrikaner child goes to an Afrikaans creche or Pre-Primary, then goes to an Afrikaans Primary School and ends off in an Afrikaans Highschool, in most cases, and that does not seem to be a taboo.

Behold,a child of Colour attends a Black Pre-Primary, goes to a Black Primary School and ends off with a Black Highschool but is seen as "not academic enough, not fitting in enough, not cool enough."

Not all Black African or Township Schools are what you believe they are.  Give Black teachers credit where it's due. They also do try their best.