A few thoughts:
1) there have been many threads on this topic that are worth reading
2) this is an olympic class event where the competition is intense. Very often it isnt the applicant is bad but that so many people are good. There are 800,000+ individual applications transmitted to 150+ individual medical schools presenting perhaps at best 150,000 interview slots. That would mean at least 650,000 applications must be rejected prior to II. With multiple acceptance offerings and WL at 3.5x 21,500 spots means about 75,000 applications get an acceptance and/or WL.
3) Some estimates:
-At least 5-10% of those with 518 MCAT or higher never attend medical school
-At least 12%-20% of those 514-517 never attend medical school
-At least 20%-25% of those 510-513 never attend medical school.
4) applying to medical school is more than your scores.
5) Does the application have balanced ECs including clinical volunteering, community service, research, shadowing, leadership?
6) Does the application have any glaring deficiencies in any area ?
7) are the schools targeted appropriately for the GPA/MCAT/Mission/Residency for the applicant?
8) Does the applicant present a coherent and concise application, well written, across EC, PS and secondaries?
9) Does the application clearly define the motivation, commitment, and achievement along with the personal characteristics that are sought for physicians in training?
10) Does the application present any compelling factors of life story, service, or similar
11) Does the application present any flags?
12) At any individual school, 5,000-10,000 application for 1,000 II so 80% of applications must be rejected prior to II. Schools must look for reasons to reject. In short, being good may not be enough