Year after year, Rafe Esquith's fifth-grade students excel. They read passionately, far above their grade level; tackle algebra; and stage Shakespeare so professionally that they often wow the great Shakespearen actor himself, Sir Ian McKellen. Yet Esquith teaches at an L.A. innercity school known as the Jungle, where few of his students speak English at home, and many are from poor or troubled families. What's his winning recipe? A diet of intensive...