A survey showed that noise levels in school are much louder than guidelines say they should be.
Kids have to put up with chatting and the 'babble' of classrooms, aswell as outside noise like traffic and aeroplanes flying past.
And in tests, children did worse on spelling tests when there was more noise. They got around three or four more words wrong, than when they were tested in quiet conditions.
Some schools have found that putting in more carpets, and double glazing, helped pupils to concentrate and hear better.
One of the people behind the survey said: "If we want our children to perform well in school we need to tackle factors that interfere with learning."