Matthew Kelly was in danger of becoming one of them. Tests showed he had a high intellect, but Mr. Kelly regularly skipped homework and was barely passing some of his classes in his early years of high school. He was living in a motel part of the time and both his parents were out of work. His mother, a former nurse, feared that Matthew had so little interest he would drop out without graduating. Then his guidance counselor suggested he take some courses at a nearby vocational academy for his junior year. For the first time, the sloe-eyed teenager excelled, earning A’s and B’s in subjects like...