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<p>You sound like a serious BS/MD applicant, and hence my reply. Selection for GAP invitation is mostly a numbers based screening to identify serious contenders (akin to HPME pre-app if you know of it). The actual application stage involves multiple medicine-oriented essays, and a chance to highlight passion and exposure to medicine. Selected GAP applicants then go through the interview stage before final selections are made. Lot of gates here…</p>
<p>You probably know that the typical serious BS/MD aspirant has high stats (GPA>3.75, SAT>2200 or ACT>32), and will have no trouble getting admitted to Pre-Med or Bio-Med/Engg without the optionals (Essays, LoRs, etc). Explore if they will let you augment the no-fee Pitt-Prestige app, with an email/fax of your essay (say from common app) and resume/activity-sheet with medical ECs.</p>