Elementary education encompasses pre-school education, primary school education and middle school education (junior middle and senior middle). Child education features infant education in the urban areas, and pre-school education in the rural areas. Lengths of schooling are: five or six years for primary schools, three (mostly) or four years for junior middle schools, and three years for senior middle schools. A nine-year compulsory education is provided in China, covering education at primary school and junior middle school levels. Graduates from primary schools involved in the nine-year compulsory education may go to middle schools directly for three-year study. Graduates of junior middle schools cannot go on to senior middle schools unless they pass entrance examinations organized by local education authorities.