Unlike studying Medicine in Europe, study in medicine in the U.S.A. generally begins after completion of four years of undergraduate study which includes meeting the pre-medical school course requirements along with obtaining a bachelor's (B.A.) degree in any subject. The requirements (prerequisites) to study medicine in U.S.A vary from school to school, but almost always include biology, general chemistry, and organic chemistry as main science courses. Some schools may also require that you have taken other humanities, English, math, and science classes as well, so make sure you look into medical schools while you are still an undergraduate so you can choose your classes appropriately. University medical study in U.S.A is a 4 year course divided into two roughly equal components: pre- clinical (consisting of didactic courses in the basic sciences) and clinical (clerkships consisting of rotations through different wards of a teaching hospital). This program leads to Doctor of Osteopathic Medicine (D.O.) or Doctor of Medicine (M.D.) depending on the medical school; both degrees allow the holder to practice medicine after completing an accredited residency program.The main prerequisite is to have a bachelor degree in biology, chemistry or other field relevant to medicine A few medical schools provide limited programs beginning after high school that combine undergraduate college study with medical education. Students are admitted provisionally to these programs based upon their high school credentials and, if their performance is satisfactory, are permitted to progress to the M.D. degree. This program generally takes six or seven years and admission to it is extremely competitive for foreign students.