First fall in GCSE grades in exam's history
23 August 2012 Last updated at 19:29 BST
Education Secretary Michael Gove has denied there was any political interference that could have influenced this year's GCSE results - as A*-C grades fell for the first time in the exam's history.
Mr Gove said exam boards made their own decisions about where to set boundaries, amid claims of last minute changes to English GCSE grading criteria.
Chris Buckler reports.