As a white male from South Africa, I can assure you this wouldn't have been my reality were I still living there. Black people make up approx 80% of the population, and this would disproportionally be theirs. Reasons date back to the Apartheid regime, which deliberately kept non-whites uneducated, as well as some horrendous mismanagement under the current ANC governnment under then-president Jacob Zuma (who himself serious under-valued education in general).
Just as one example: there was a famous incident where, due to some corrupt dealings, textbooks weren't able to be delivered in Limpopo (one of the provinces) for several years in a row. For many years there have been schools with 0% high school graduation rates. The infrastructure and processes that are taken for granted in developed countries are only really available to a minority in SA. This makes a huge difference.