It might be interesting to investigate what school syllabi contained in SA around 1930; I imagine that it would have been strongly influenced by British education. There was no wide-spread education of Black people yet. If it should be called "apartheid education" depends on your definition thereof. Apartheid was the policy of the National Party, which came to power in 1948. Lately there has been a tendency to deny all changes of government prior to 1994, when the ANC came to power, and refer to all SA governments prior to ANC rule as the apartheid era.
The first act that might have contained an element of eugenics was the
Immorality Act of 1927. This act prohibited extramarital sex between White and Black persons. It remained legal for White persons to have sex with Coloured or Indian races outside marriage and a White person could still marry a Black person. It therefore seems unlikely that the driving force behind this act would have been eugenic; more likely it was some moralistic views on sexual behaviour.
One of the first acts of the National Party was the
Prohibition of Mixed Marriages Act of 1949. This act banned marriage between a "European" and a "non-European" and was unmistakably influenced by eugenics. In 1950 the Immorality Act was amended to include a prohibition of sex between White persons and Coloured or Indian persons. Both acts were repealed in 1985.
A far-right splinter group of 1969, the Herstigte Nasionale Party, contested elections under the slogan "Bly Blank my Volk". They have never won a seat in parliament, but
still exists.In its broader meaning, eugenics also have application in agriculture and I would be careful not to assume that the charts are related to apartheid education. I recall learning about hereditary paterns in biology, but certainly not about human eugenics.