Don't they do a random quality control test as they take them out of the printer? I'm taking OCR for Biology...hmmm...
Thousands of teenagers are facing uncertainty over their exams after their GCSE music papers were found to have the answers on the back.
The paper - taken across England - apparently featured a list of composers, which related to the answers to questions written on the other side.
Examination board Oxford, Cambridge and RSA Examinations (OCR) has said pupils will not be asked to resit the paper.
The problem came to light at schools in Herefordshire and Worcestershire.
Some pupils apparently noticed the errors while others did not.
In a statement OCR said: "OCR regrets that a printing error may have affected a small number of marks on the GCSE Music question paper.
"We are putting procedures in place to identify the effect, if any, this had on candidates and to make allowances accordingly to ensure that no candidate is disadvantaged."
The exam board said it believed "thousands of pupils" could be affected.
Last year OCR's music GCSE was taken by 12,637 candidates - roughly a fifth of the total number of students taking music GCSE (61,249).
General secretary of the NASUWT teaching union Chris Keates said it was an incident which showed once again that exam boards were "accident prone".
"This puts a shadow over pupils' exams and adds to the anxiety. No system is perfect and we would not expect it to be but the exam boards seem to have a dubious track record."