The UK failed to make the top 20 in any of the three subjects in international tests taken by 15-year-olds.
In 2009, the UK placed 16th in science, but this year only made it to number 21. However, the pupils' performance in maths and reading has improved.
- In 2009, the UK placed 25th for reading, today this rose to 23rd
- In 2009, the UK placed 16th in science, today this fell to 21st
- In 2009, the UK placed 28th in maths, today this rose to 26th
More top news
Temperatures will reach around 28 Celsius (82F) at their highest.
A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.
New research has found those who consumed two cups had a 35% reduced risk, and for those who drank five cups, the risk halved.