„The proportion of school admissions based on academic performance increased significantly in 34 of the 59 countries and economies that participated in PISA in both 2009 and 2015. […] The trend towards more selectivity is observed between 2009 and 2015 in both lower and upper secondary schools in many countries.“
OECD (Hrsg.), „Balancing School Choice and Equity: An International Perspective Based on PISA“ (2019), S. 39