This always reminds me of a South African friend of mine and some of the stories he had, high tech farms taken from white occupants and given to blacks for reparation. They are then stripped of any copper and left to ruin. This will someone end up being the fault of white farmers for building industry that has a requirement to be maintained.
Riches waiting to be exploited everywhere on that continent and yet their nations have just gone backwards.
I think it's fairly well accepted that east Asians do better academically than others, how much of this is due to culture vs genetics is an interesting subject. It's not racist to point this out. Is African failing cultural or genetic?
None of which has anything at all to do with intelligence, in the slightest.
What you're describing is situations. Poor people with bad education and a peoples who were oppressed for decades, hundreds of years really, who wanted to take back their land. What happened was stupid, but you had oppression and white people taking land and then having the rewards of the oppression by keeping the land. People who didn't farm not knowing how to farm well isn't indicative of intelligence, it's indicative of poor people who weren't trained. it doesn't mean they can't be trained, it doesn't mean they are too stupid to learn, it's that the people who lived there spent a lifetime farming and those who took the land (back) hadn't spent a lifetime farming.
A potential measure of intelligence would be comparing a black farmer who owned land for the same amount of time as the white farmers and if they were all incapable of farming. I mean, if you went and took over a farm today... would you instantly be as successful as the people you took the farm from, no, of course, does that mean you're stupid, no, because it's got nothing at all to do with a measure of intelligence.
AS for asians doing well academically, again no not really, culturally they are pushed harder in general and their society/culture place a higher emphasis in academic study. Again people studying harder is not a measure of intelligence, but knowledge, culture, personal decisions. intelligence would be if one set of kids couldn't learn to the same level given all the same teaching, education to that point, etc.
There are few studies anywhere that can measure racial differences in intelligence, because schools in south africa and schools in England aren't generally comparable. There are too many differentiating factors in different cultural groups, in how much education their parents had, in how early they are expected to start working to help support the family, in how high an emphasis their society places in education, in the quality of education available, etc, etc.