"Young Fives" may be old enough for kindergarten, but are they developmentally ready? . To address the needs of these children, some schools are offering transitional kindergarten (TK) classes, which promote positive socialization, hands-on learning, and emergent literacy. But there’s also an ample amount of play time. After a year of TK, children either go on to a year of regular kindergarten or on to first grade, depending on their readiness.