i;m doing edexcel, how many mark to earm on each paper
OK. It's important to remember that in the actual GCSE, grades are not assigned per paper. Instead, your marks on each paper are summed and a grade is assigned to the total.
That being said, Edexcel do provide what they call "notional" grade boundaries where they "split" the overall marks required for each grade based upon the weighting of each paper (which are the same for maths) and the relative difficulty of each paper.
For June 2023 these notional grade boundaries are below, for both foundation and higher tiers.
You will note that for a grade 7 you would have needed about 48 marks per paper, for a grade 8 about 58 marks per paper, and for a grade 9 about 68 marks per paper.