Harvard's Faculty of Medicine will consider graduates of accredited degree-granting colleges and universities throughout the world, though international students are required to supplement their previous college education with at least one year of higher education in either Canada or the United States. You will also have to demonstrate to the admissions committee that you have the aptitude and skills needed to succeed as a practitioner of medicine.
Post-secondary training in biology and physics is required of all Harvard Medical School applicants. Technically speaking, applicants must show "aptitude" for these subjects, but do not necessarily have to have a degree in either of them. You should have similar aptitudes for biochemistry and molecular biology.
Students are required to have at least one year of college-level calculus as well as one year of calculus-based physics in their educational backgrounds. A strong working knowledge of linear algebra and differential equations is also required.
Harvard Medical School also wants applicants to have strong writing skills, and they favor candidates who have not solely concentrated their studies on science and mathematics. They prefer students who have taken at least one semester's worth of arts, humanities, social science, literature and/or language studies, and they strongly recommend that applicants are comfortable using modern computer technology.
You will have to take a standard medical school entrance examination known as the MCAT before applying to Harvard Medical School, and submit your MCAT score along with your transcripts, letters of recommendation and all other required documentation. Harvard Medical School does not publish its "cutoff score," but you should operate under the assumption that they will only consider applications with very high MCAT scores.