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In France, the difference in science performance on the 2015 PISA between the richest and the poorest students was 115 points ...

„In France, the difference in science performance on the 2015 PISA between the richest and the poorest students was 115 points. […] A 100-point difference in PISA scores is roughly equivalent to three years of schooling.“

The World Bank (Hrsg.), „Learning to Realize Education's Promise“ (2018), S. 78