free. Also, during compulsory school running races and similar events, medical teams are always present. Facilities Primary schools can have cafeterias which provide students with meals for the lowest price. They offer mostly croissants with the filling, but some have hamburgers, french fries and more. Some schools offer cooked meals, but their cost is much higher. Excursions (ekskurzija) are one- or two-day trips to places around Serbia and Europe and are organized by the particular school and only in primary and high schools. Supplementary education is carried out for students with aspirations of learning more about the particular subject, participate in competitions, earn scholarships and prepare for further education. Complementary education is carried out for students with bad grades. Its goals are to help students catch up with lectures, not with learning lesson only for the test, but also with remembering core part of that lesson for longer. It can also be attended by students with higher grades, especially as a preparation for the upcoming test. Higher education Tertiary education The school year starts on September 1st and ends on May 31st and it is split into two semesters. There are six regular exam blocks every school year and several irregular ones which are different for every college or university. Tertiary level institutions accept students based on their grades in high school and entrance exams results. College or 'Higher School' (viša škola) lasts for 3 years. In Serbia, it corresponds to professional universities. After graduating from college, students get a bachelor's degree in Applied Sciences or an equivalent diploma. Faculties (fakultet) of universities (univerzitet) and art academies (akademija umetnosti) last for 4 years until baccalaureate, 5 years until magistracy and 8 years until doctorate. Only exception are the Medical schools, lasting for 6 years until Doctor of Medicine. Serbia has 17 universities, of which 8 are public and 9 are private, 63 colleges of applied sciences, of which 47 are public and 17 are private, and 8 colleges of academic studies, of which 3 are public and 5 are private. Serbian citizens can study at public universities for free, while tuition is low for foreign students. Tuition costs at private schools vary. Quaternary education Postgraduate education (post-diplomske studije) was made of further specialization and doctorate during the times of Socialist Yugoslavia. However, the Bologna Process (which Serbia signed in 2003) abolished the quaternary education and incorporated it into the tertiary