If you haven’t got enough APs then you would get a conditional offer based on your senior year APs (so you wouldn’t know if you are in until July, this is how UK students do it with A-levels, they find out in mid-August). So the minimum requirements just serve to weed out applicants who have zero chance of success. They don’t get you in. They are likely to favor candidates who have taken the test once rather than multiple times. You have to report all scores/tests taken.
You need to pass the TSA (considerably harder than the SAT/ACT) and have a good recommendations (including predictions of 5s in senior year APs) plus personal statement (showing interest in your subject, not community service etc). They cut 70% or so at that stage (mostly based on TSA score). Then you need to ace the academic interview where 1 out of 3 gets an offer. That’s based on how well you can answer really hard questions on your subject (not based on knowledge but on your analytical ability).
They don’t care about ethnicity, sports, community involvement, who your parents are, or anything else apart from academic ability:
http://www.telegraph.co.uk/education/universityeducation/7965715/Universities-uninterested-in-pupils-extra-curricular-activities.html