It can be very frustrating no doubt. But as it has been stated, we have no clue what goes on behind the doors of admissions.
From my interactions with them, they want someone who fits the mission and goals of the university and moreover, they want someone whom they know will be a good fit to the dynamics of the incoming class. If you did not try hard via your secondary to convince them that your experiences have culminated into an applicant that resonates with the schools vision then it won't matter if your Mcat is in the 90th percentile they'll put you on a hold/alternate pile.
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