Four examiners have lost their jobs with a Cambridge exam board after some students were graded incorrectly.
The OCR Board says mistakes were made in the transcribing and totalling of marks. The board says it's apologised and corrected mistakes.
78 markers have been told to improve and the exam board says the errors were unacceptable.
It's reassuring students who've just taken their exams that marking systems have now significantly improved.
Mark Dawe, the Chief Executive of the OCR exam board tells ITV Anglia's Education Correspondent Elodie Harper how he's dealing with a series of errors in the marking of last year's GCSE and A-Level papers.