USMLE is a worldwide examination conducted by the United States to select the best doctors, who have the knowledge, the skill and the acumen to care for the American public. Considered the world's toughest exam, the USMLE attracts the best and brightest from around the world, but only a few will make it. The competitiveness of the exam has spawned many unethical prep courses around the world, but it has also brought out the best and best designed prep courses.