Medical and educational services are relatively well developed and are largely financed by revenues from petroleum production. Education is compulsory for children aged 5 to 16 years and it is free at all levels. Primary and secondary education is provided in Malay, English, or Chinese. The University of Brunei Darussalam (1985) is located in Bandar Seri Begawan. There are also vocational schools and a teacher-training institution. In addition, the government pays the tuition of Brunei students who study at overseas universities.