ANYBODY WHOM HAS STUDIED THIS IS WELL AWARE THAT IQ IS OVER 80% GENETIC..
WHICH MEANS EVEN THE BEST TEACHERS IN THE WORLD WOULD NOT ALLOW BLACKS TO GET GOOD GRADES
U might want to google about this if your open minded.. I can provide some links about this later if anybody wants.
Also there is a diff in av head and brain size..
Black african av brain size is 1250 cc etc
Then, of course, there's that other 20%, totally dependent on environmental factors like nutrition, exposure to toxic substances and culture.