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Notes -
I think the reason for higher rates of comorbidities among low-IQ individuals from higher-IQ populations is that you're very unlikely to get an IQ two standard deviations below the mean purely because of additive genetic effects, so a large proportion of people with IQs this low are going to have some major developmental disorder causing the cognitive deficit. On the other hand, if an IQ of 70 is only one standard deviation below the population mean, then a sixth of the population is going to get there with additive genetic effects and a relatively small proportion will get there through some major developmental disorder.
I don't think it works the other way. The only way you get an IQ two standard deviations above the mean is with additive genetic effects. There's no anti-Down syndrome, where you can get an extra chromosome that gives you 30 extra IQ points.
However, it's worth noting that black students don't actually perform better in college than white students with the same test scores. They're just more likely to enroll and stick it out to the end. This is why I suspect that non-academic factors like higher family SES and athletics play a role. Unlike raw IQ, educational attainment has a substantial shared environment component in twin studies, probably due to a combination of cultural attitudes toward education and parents' ability to help pay for college.
Or it could be the same reason women are more likely to stick college out all the way through, whatever that is- probably a willingness to switch their engineering major for psychology where white men would leave and go to welding school.
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