It's certainly possible - I got my A level maths remarked because I was 5 marks off an A* and ended up gaining 6 marks, but that's very unusual. It depends whether you're willing to pay for it to be a remarked, bearing in mind that your mark could go down - it would be worth talking to one of your teachers and seeing if they think it's worth remarking it. If they think it is, you might be able to get funding from the school for the remark.