The overhaul of the GCSE grading system will make it easier to spot the brightest students, Ofqual suggested.
Currently, in some subjects such as maths and science, high numbers of pupils achieve A* and A grades which makes it difficult to pick out the top students.
Chief regulator Glenys Stacey said that in these cases "you then begin to question whether the qualification is doing its job in differentiating sufficiently your most able students."
More top news
Brexit Secretary David Davis has insisted EU opposition to UK proposals on the Irish border are no more than an ‘opening position’ in negoti
The pontiff was speaking as the leaders of North and South Korea prepare to meet in the Demilitarised Zone.
Judges have had to weigh up complicated issues in reaching their decisions.