I don't think skin color has much to do with it at all. A poor environment factors into the equation - less parental interest in education, teachers who are themselves half educated, less self determination to achieve despite the odds.
I don't think skin colour has anything to do with it either. except as a proxy to estimate the racial mixture of the black (?) person. so you believe that dark skinned blacks have a worse environment than light skinned blacks? that parents and teachers of dark skinned blacks are ineffectual compared to the parents and teachers of light skinned blacks? and that dark skinned blacks have less self determination to achieve compared to light skinned blacks?
wow! I did not know that! actually I think I disagree with almost everything you said. do you say the same thing everytime you talk about blacks. were you just on cruise control and didn't realize what the subject was?