GCSE change? Watch
Unless you're in Wales... Wales are sticking with the A*-G grading. And in Northern Ireland it apparently depends on the exam board you're sitting!
I feel really bad for you if your teachers didn't bother to inform you of this but seriously I don't know how you wouldn't have heard about this previously. English lit/lang and Maths have been reformed for this year's GCSE exam sitting so yeah, your maths/English grade will be from 9-1 or a U (hopefully not a U though!) A 4 is a pass, a 5 is a 'high pass', a 6 is the same as a B, a 7 is an A, an 8 is an A*, and a 9 is the top 3-5% of the country, so think of it as a stronger A*.
Every other GCSE exam you get a result for though will be A*-G.