A new grading system was introduced last year, using the numbers 9-1, with 9 being the highest grade available, in subjects including English Literature, English Language and Mathematics. A further 20 subjects will use the new grading system this year, with most others following in 2019.

The reformed exams are described as having "a wider and more challenging range of content," and the Committee for Education, Sport and Culture said the new grades have been brought in to "better differentiate between students of different abilities, particularly at the higher end of the scale."

It is expected that fewer Grade 9s will be awarded than A*s are currently.

Pictured: It is that time of year when a student's hard work at school pays off with the release of their GCSE results 

As well, there are now IGCSEs (International GCSEs) available which are alternative qualifications at the same level as GCSEs. There are currently IGCSEs available using both the A*-G scale and the new 9-1 scale.

ESC said some students may therefore receive grades on the A*-G scale, depending on the qualifications the school they are at has chosen.

ESC said students sitting these examinations for the first time will not be disadvantaged as in the first year each new GCSE subject is introduced, broadly the same proportion of students will be expected to get a Grade 4 or above as would have achieved a Grade C or above in the old system. This is the standard equivalent to a Level 2 qualification, and most commonly determines progression to Level 3 study, including A Levels, International Baccalaureate (IB) or Level 3 Vocational qualifications.