Medical schools operate on a yearly cycle with rolling admissions. They start accepting applications in June of the year prior to when one would start school (i.e. 14 months before you would start classes). Because admissions are rolling, applicants are at a disadvantage if they apply late; for borderline candidates (and this is a substantial portion of candidates!), a late application keeps them out of medical school at least for a year. Applying the fall of your senior year is TOO LATE; students should plan to apply in June; and applying in June requires some preparation before June (see timeline).