I have no experience in data interpretation, so please be forgiving. But isn't it the case that:

    60,000 white students * 0.04 = 2,400
     4,000 Asian students * 0.25 = 1,000

These cohorts seem fairly similarly-sized, to my thinking. If you're thinking of either curriculum, culture, or parental involvement (I don't think it matters which), it seems to me that looking at this at the level of percentages is not the best heuristic for thinking about which students are prepared to attend top universities. There just aren't that many students who get whatever it is they need to achieve that.