It's not a set percentage, but it hovers around the 80% region. The grade boundaries are subject to change every year based on the nation's average for GCSE results. Before establishing the grade boundaries, examiners calculate an average of all of the GCSE results (this applies for other subjects as well as maths). If they are worse than the previous year, the grade boundaries will decrease slightly and if the results are higher than the previous year then the grade boundaries will increase, but it can be either side of 80%.
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