More than 1,000 students may have been awarded lower GCSE mathematics grades due to a change in an exam question, prompting calls for grade reviews from opposition lawmakers. The controversy centers on an altered approach to a question on "error interval" calculations in last year’s Cambridge OCR mathematics exam.

According to Brett Williams-Yale, a mathematics teacher at Michaela Community School in Wembley, the question deviated from the method taught in classrooms, leaving many pupils unable to provide the required answer. He identified 1,609 candidates nationwide who missed a grade by just one mark, suggesting the modified question may have adversely affected their results. “Some of them will have failed maths because of this. But they have no idea,” Williams-Yale said, noting that previous exams followed a different standard that teachers typically prepared students for.

The issue was formally raised with Ofqual, the exam regulator, which acknowledged inconsistencies in the question format compared to similar past questions. Ofqual indicated that this inconsistency could affect candidates’ ability to interpret the question fairly and predictably and stated that it is considering further action.

Shadow Education Secretary Laura Trott echoed concerns, emphasizing potential consequences for over 1,000 students who missed their grade by a single mark. Trott warned that some students might face unnecessary resits, while others could see their future opportunities limited through no fault of their own. This is significant given that many school sixth forms and colleges require minimum mathematics grades for admission to A-level courses.

Cambridge OCR, responsible for setting and marking the exam, defended the question, stating it was designed and graded based on correct mathematics and that similar marking approaches were applied in 2017, 2019, and 2024. The exam board rejected claims that over 1,000 students near grade boundaries were unfairly disadvantaged, maintaining that accepting incorrect answers would be unjust.

The debate highlights ongoing tensions between examination standards, fairness, and teaching practices, with regulatory authorities examining potential remedies to address the concerns raised by educators and students alike.