Why are South Africa's schools so bad?

South Africa’s Education Minister Angie Motshekga recently said that the country's schools were a "in crisis".

It comes in the wake of dismal exam results and continued high drop-out rates.

Ms Motshekga said the government was doing its best despite the legacy of apartheid.

Our Southern Africa correspondent Karen Allen asked her why almost 22 years since the end of white-minority rule, the school system was such a mess.