However, Chris King – chairman of the Headmasters’ and Headmistresses’ Conference (HMC) – argued that the changes to the exam appeal system will have "lifelong consequences" for bright pupils who will miss out on Oxbridge places by a few points because of subjective marking.
He told the Telegraph: “This unfair situation could have a seriously harmful impact on young people’s life chances.
“For example, there is a risk that students might not get the marks they deserve and miss out on a place at Oxford, Cambridge or another top university or medical school.
“One or two marks can mean the difference between fulfilling their dreams or being forced to completely rethink their futures.
“Lack of accuracy and fair appeal is not only wrong but has lifelong consequences; this is why we call on the regulator to put the wellbeing of students rather than the system at the centre of its approach.”
His warnings came as hundreds of thousands of students prepare to learn their A-level results later this week.
The HMC and the National Association of Head Teachers (NAHT) have warned students and parents that this year “it may be harder than ever before for A-level candidates who appeal their grades to get a fair outcome”.