The Department for Education (DfE) have published an information sheet about the new GCSE grades for parents which explains the new  9 to 1 grading system that is replacing the A to G.  Grade 9 is the highest grade and will be awarded to fewer students that the old A* English and Maths GCSEs used the new grading system in 2017 and the rest of the new GCSEs will be rolled out, most will change to the new grading system in 2018.    

 The sheet from the DfE can be viewed here