Ok so im in year 11, doing my GCSEs rn ofc, i personally was always good at maths but struggled at english. So heres my advice i finished year 10 with a 6 in english both language and lit. I had no hope for english and i was dissapointed as i got 8/9s for everything else. English was always harder for me, probably because it is my 3rd language but never give up on a subject you think you are bad at. I found a very helpful teacher on youtube for english i used him for my notes and ideas and got an 7 in both my christmas mocks for lang and lit and then an 8 for both lang and lit for easter. So do not stress, you still have a lot of time to improve and i reccomend watching The GCSE maths tutor on youtube to cover any content you are unfamiliar with or do not understand. Trust me when i say you can improve by a lot - im the literal example, got 29/30 3x in a row recently for my literature essays. Anything is possible if you put in the work. I hope this helps