Drinking a glass of water could help you do better in exams, researchers have suggested.
A new study found that students who took a drink, such as water, coffee or cola, before taking an exam did up to 10% better than those who did not - the difference between a grade.
It is unclear why a drink should help, but one theory suggests that information flows more freely between brain cells when they are well hydrated. Drinking water may also calm nerves, while those who became thirsty during the test could be more easily distracted, the Daily Mail reported.
The study, which looked at hundreds of university students, compared whether they took a drink into the exam with their marks. The students' overall academic ability was then factored in.
Those who arrived with drinks did around 5% better on average. But the improvement was even more marked among those just starting out at university, whose results improved by as much as 10%.