Each year, more than 15,000 U.S. medical students--along with more than 18,000 graduates of foreign medical schools and schools of osteopathic medicine--take part in the National Residency Matching Program, vying for a small number of positions in the United States. In this keenly competitive environment, they seek every advantage they can get. Based on more than two decades of experience preparing candidates for residency programs, John Canady has...