„England’s average position in the PISA 2012 study compared to above average performance in the IEA’s Trends in International Mathematics and Science Study (TIMSS) and Progress in International Reading Literacy Study (PIRLS) of fourth and eighth graders (years 5 and 9 in the UK), indicates that the problem of underachievement worsens in the final years of lower secondary education.“
EU-Kommission (Hrsg.), „Education and Training Monitor 2015 – Country analysis“ (2015), S. 274