Grading for biology

How does grading work for the GCSE higher tier combined science. Like I messed up biology paper 1 and I think I got like 16 marks. I want to get a 7 how many more marks would I need in the rest of the papers to achieve that. For AQA do they collect all the results for paper 1 and give you a grade and then do that for paper 2.

About 85 in paper 2 I think

I would need 85 in each paper do you mean? Because each paper is worth 70 marks

Which exam board is it?