- 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
Police are warning van drivers to be vigilant following a spate of catalytic converter thefts in the city.
Patients needing orthopaedic surgery in Wales will be asked to lose weight and give up smoking as NHS struggles to cope with waiting lists.
The Prime Minister has defended an RAF air strike that killed two British jihadists in Syria, including Reyaad Khan from Cardiff.