„Schools have started offering specialisation in particular subjects in the curriculum or placing an emphasis on a few more general themes (e.g. mathematics, communication, etc). These ‚classes with a special emphasis‘, also known as ‚following an extended curriculum‘, function as separate streams within regular municipal schools. […] In large urban municipalities, 30-40 % of pupils are selected for a class with special emphases. Students apply for and enter classes with a special emphasis through aptitude testing, which can result in ability grouping.“
OECD (Hrsg.), Finland’s Right to Learn Programme (2022), S. 47.