„In England, the relationship between ESCS (Anm.: Economic, Social and Cultural Status) and average maths score has not improved since 2006, with the difference between the most and least disadvantaged students being equivalent to over three years of schooling. […] The recent PISA results suggest Germany has managed to improve in all three subjects whilst decreasing inequality in its school system. The proportion of resilient students has also risen from 25 per cent in 2006 to 32 per cent in 2015.“
NFER (Hrsg.), Key insights for England from PIRLS, TIMSS and PISA (2018), S. 8f.