However, the research, carried out by YouGov on behalf of Ofqual, the exams regulator, found that the pace of change in qualifications and examinations was a major cause of concern in schools, leading to disquiet among professionals.
Almost 3,500 heads, teachers, students, parents and members of the public were interviewed as part of the survey.
It found that nearly half of teachers lacked confidence in A level grades, and a similar proportion believes marking has become less accurate over the past two years.
But the majority of heads (81 per cent) and teachers (74 per cent) had confidence in A levels overall.
When asked what percentage of candidates they thought got the right A level grade, heads said between 71 and 80 per cent of students achieved the grade they deserved.
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