„The strong French SES gradient in PISA suggests that the benefits for equality of its world-leading preschool system are eroded throughout primary and lower secondary schooling, such that it ends up with an internationally high gradient by age 15, with a level similar to that in Germany.“
Jascha Dräger u.a., Cross-national Differences in Socioeconomic Achievement Inequality in Early Primary School (2024), S. 14.