The Office of Qualifications and Examinations Regulation (Ofqual) has revealed how the new GCSEs will be graded, moving to a numerical system.

This major shake-up in the education system will result in fewer students gaining top marks, as a consequence of more stringent criteria.

GCSEs will be assessed from 1 to 9, with 9 being the highest grade attainable (equivalent to an A*). Grade 1 will be akin to the bottom grade of a G, grade 5 will be similar to a level C.

This is a key distinction to note. A direct comparison between the new grades and the previous ones is not advised.

Chief regulator Glenys Stacey said that a "great deal of consideration" had been given to how grades are set, with extensive consultation having taken place.

"We are being quite clear that the approach in that first year will draw heavily on statistical evidence to make sure that there are clear ‘anchor points’ from the old system to the new," she explained

"This will make sure that the year group of students are not disadvantaged, or advantaged, because of the introduction of the new qualifications, and will provide some certainty about what to expect at this time of significant change."

Speaking to the BBC, Brian Lightman, general secretary of the Association of School and College Leaders, commented that the changes to the grading system will be judged against how effectively they are implemented.

He explained that it is over simplifying the matter to perceive that tougher exams will boost standards in education.

"Excellent teaching and clear leadership are what enable students to achieve more," Mr Lightman told the broadcaster.

"Students must not be disadvantaged by the change in grading. What is important is that Ofqual sets out very clearly to teachers and students what is needed to achieve a specific grade."