"Then I read somewhere that for diversity reasons after those students(the black and the Hispanic) are admitted to the top universities, they actually don't hav

"Then I read somewhere that for diversity reasons after those students(the black and the Hispanic) are admitted to the top universities, they actually don't have a nice experience at all, most of them simply can't catch up and some of them drop out." Yes, there's been a fair amount of research on this. Essentially, once you get beyond the very very top, I'm not sure what beyond Harvard and MIT (and of course CalTech), there just isn't a large enough pool of qualified candidates. So at each "level" a large fraction of these students admitted and accepting belong in a school one or two levels down, where they could thrive.