Pisa tests: UK lags behind in global school rankings
The UK's test results remain behind the top-performing Asian education systems.
The UK is still lagging behind leading countries at education and has made little progress in international rankings since results three years ago.
The influential Pisa rankings, run by the OECD, are based on tests taken by 540,000 15-year-olds in 72 countries.
The UK is behind top performers such as Singapore and Finland, but also trails Vietnam, Poland and Estonia.
The OECD's education director, Andreas Schleicher, describes the UK's results as "flat in a changing world".