Primary and secondary education is free at all stages, however there also are private schools with tuition fees in Vilnius. The education system is governed by the Government of Lithuania and the Ministry of Education, Science and Sports of Lithuania which headquarters are in Vilnius. Cathedral School of Vilnius, first mentioned in 1397, is the earliest known Lithuanian school. Vilnius Vytautas the Great Gymnasium, established in 1915, is the first Lithuanian gymnasium in Eastern Lithuania. In 2018, the city had 120 schools (not including preschools) with 61,123 pupils and 4,955 educators. Four out of five best rated schools in Lithuania are located in Vilnius, while the Vilnius Lyceum is the number one. Ethnic minorities in Lithuania are allowed to have their own schools. In Vilnius there are 7 elementary schools, 8 primary schools, 2 progymnasiums and 12 gymnasiums dedicated exceptionally for minorities children where lessons are conducted in minorities languages only. In 2017, there were 4,658 Poles and 9,274 Russians who studied in their minorities languages in the city. Vilnius has 11 vocational schools which provides vocational education. National M. K. Čiurlionis School of Art is the only art school in Lithuania spanning the entire 12-year learning cycle. Vilnius Justinas Vienožinskis Art School is another prominent art school in Vilnius. Most of the school graduates in Vilnius later studies in the universities or colleges as Lithuania is one of the world's leading countries in OECD's statistics of population with tertiary education (56% of 25–34 year-olds in 2018). Vilnius has 9 international schools: International School of Vilnius, Vilnius International French Lyceum, British International School of Vilnius, American International School of Vilnius, etc. Libraries The Central Library of Vilnius City Municipality () operates public libraries in Vilnius. It has 16 public libraries, located in different elderships of Vilnius, one of them (Saulutė) is dedicated to children's literature only. Large part of these libraries organizes computer literacy courses that are free of charge. Usage of public libraries requires a free LIBIS (integrated information system of Lithuanian libraries) card. Martynas Mažvydas National Library of Lithuania (), located in Gediminas Avenue and founded in 1919, is a national cultural institution which collects, organizes and preserves Lithuania's written cultural heritage content, develops the collection of Lithuanian and foreign documents relevant to research, educational and cultural needs of Lithuania, and provides library information services to the public. As of 1 July 2019, its electronic catalog has 1,140,708