Please substantiate your claim of fact (the purpose) with a link.
It discriminates against anyone who did not graduate in the top 10% of their class - which means any student of any race, creed, color, religion, etc... who is not in the top 10% of their class is "discriminated" against.Note how the 10% bit started showing up where there was a backlash against discriminatory admissions policies. We never heard anything of it until then. It's a way to discriminate without appearing to discriminate, akin to things like height requirements to keep out women.
You think they're going to admit why they're doing it?