Schools were told to change less than 1 per cent of teacher-assessed A-level grades as a result of the external quality assurance process carried out by exam boards this year.
Evidence from approximately 1 in 5 schools and colleges was reviewed by the exam boards' subject matter experts, and grades from 85 per cent of schools were endorsed at the first review.
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But for the remaining 15 per cent, grades were discussed by teachers and the boards' curriculum leads and fewer than 1 per cent of grades had to change as a result.
As part of the quality assurance process, every school grading policy was reviewed, and exam boards contacted schools where they required clarification.
All grades were reviewed after they were submitted on 18 June, with every school submitting examples of pupils' work, with the vast majority carrying this out within 48 hours of exam boards' request.
A very small number of cases where grades need to be revised are ongoing, with grades withheld, but the numbers of cases and subsequent changes will be published by Ofqual, probably in its summer report published in December.