A medical school is a tertiary educational institution—or part of such an institution—that teaches medicine, and awards a professional degree for physicians Admission to medical school in the United States is based mainly on a GPA, MCAT score, admissions essay, interview, clinical work experience, and volunteering activities, along with research and leadership roles in an applicant's history. While obtaining an undergraduate degree is not an explicit requirement for a few medical schools, virtually all admitted students have earned at least a bachelor's degree.