GCSEs in England have reformed and will be graded with a new scale from 9 to 1, with 9 being the highest grade.
New GCSE content will be more challenging.
Fewer grade 9s will be awarded than A*s.
English language, English literature and maths will be the first to be graded from 9 to 1 in 2017.
Another 20 subjects will have 9 to 1 grading in 2018, with most others following in 2019. During this transition, students received a mixture of letter and number grades.
The new grades are being brought in to signal that GCSEs have been reformed and to better differentiate between students of different abilities.
In the first year each new GCSE subject is introduced, broadly the same proportion of students will get a grade 4 or above as would have got a grade C or above in the old system.