After finishing secondary school students usually take a school-leaving exam (matura in German, "maturita" in Slovak), which is a basic prerequisite for visiting a school of higher education (college), especially a university. Before 1990 this included obligatory exams in mathematics (written nationwide standardized + oral), Slovak incl. literature (written nationwide standardized + oral) and Russian and in one subject of the students's choice. After 1990, the system was changed, so that every school prepared its own tests and questions – at gymnasia in the subjects: Slovak incl. literature (written and oral), a foreign language (written and oral), two subjects of the student's choice (oral). The obvious problem of this system was low or missing comparability of the results. The maturita system was modified in 2005 again. The new system is supposed to replace the current entrance examinations to schools of higher education (colleges) in the future. The main changes are: one additional exam subject (for gymnasia), nationwide unified written tests for languages and mathematics (other subjects are supposed to follow in the future), a high degree of standardization of other exams, as well as the possibility for the student to choose whether they want to pass an A-level exam (the simplest one), a B-level exam or a C-level exam (the most difficult one, only for languages). At gymnasia, the exam subjects include: Slovak incl. literature (written and oral), a foreign language (written and oral), a natural science subject, and two other subjects of the student's choice in Slovak: [https://web.archive.org/web/20051030075330/http://www.minedu.sk/VZPP/VYHLASKY/2004_510.pdf ]