- PISA tests are put on by the Organisation for Economic Co-Operation and Development (OECD) and look at the key skills of half a million 15-year-old pupils from 68 countries.
- They are meant to test whether pupils are being adequately equipped with workplace and life skills, with the questions focusing on real-life scenarios. They are hugely influential, though critics say they form just a small part of a much bigger picture in terms of education.
- Figures published in December revealed Wales has fallen further behind the rest of the UK in the three areas of maths, reading and science.
More top news
The heavy showers will ease during the first part of tonight, leaving a dry night with mist in places.
A 1950s pin-up girl from the Vale of Glamorgan has returned to the spot where she won the nation's hearts.
The band play the Liberty Stadium on Saturday night as part of their 'Everything Must Go' 20th anniversary tour.