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In page Vocational education:

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In Finland, vocational education belongs to secondary education. After the nine-year comprehensive school, almost all students choose to go to either a lukio (high school), which is an institution preparing students for tertiary education, or to a vocational school. Both forms of secondary education last three years,[1] and give a formal qualification to enter university or ammattikorkeakoulu, i.e., Finnish polytechnics. In certain fields (e.g., the police school, air traffic control personnel training), the entrance requirements of vocational schools include completion of the lukio, thus causing the students to complete their secondary education twice.[citation needed]