Additional Science GCSE Paper - Remark?

Hi, looking for a bit of advice. I received my GCSE results last week. I gained a D in my additional science GCSE. When I contacted the school I was 8 marks off a C grade. School are not keen to put forward for a remark, as they say that this is too many marks away from a C. Has anyone got a remark with so many marks away in science and got a positive grade change?
Many thanks

8 marks isn't too close, and unless serious errors have been made with the marking of your exam, I doubt it'd go up by that much.