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In Korea, 80.9 % of primary school students receiving supplementary education ...

„In Korea, 80.9 % of primary school students were estimated to be receiving private supplementary education in 2012. In lower secondary school the proportion was 70.6 %; and in upper secondary school it was 50.7 %.“

OECD (Hrsg.), „Lessons from PISA for Korea“ (2014), S. 89