Pre-school education in Russia is highly developed, some four-fifths of children aged 3 to 6 attend day nurseries or kindergartens. Schooling is compulsory for nine years. It starts from age 6 to 7 and leads to a basic general education certificate. An additional two or three years of schooling are required for the secondary-level certificate, and some seven-eighths of Russian students continue their education past this level. Admission to an institute of higher education is selective and highly competitive: first-degree courses usually take five years. The oldest and largest universities in Russia are Moscow State University and Saint Petersburg State University. There are also ten highly prestigious federal universities across the country. According to a UNESCO report in 2014, Russia is the world's sixth-leading destination for international students.