I don't want to be that guy that tells you it's okay to drop it now and forget about it, since the best thing to do would be at least try and do your best and persevere with it.
But, having said that, I did AS Maths (MEI) last year and absolutely hated it from the get-go, and tried to drop it in mid-October. My college wouldn't let me and I had to just keep going to lessons and doing work (albeit very poorly) etc. Exams came around, I sat them. I asked my teacher if it was okay not to turn up to any more lessons (since it was starting A2 work) and he said it was fine due to how difficult I'd been finding it throughout the year.
Results day came around, got a U (U in C1, U in C2, U in D1) and nobody has ever mentioned it since. I've applied to do Sociology at uni and received offers from all 5 universities. So in the long run as long as you don't plan on doing anything Maths related at uni then it won't matter in the slightest if you drop it. Although don't expect your centre to be that lenient when it comes to dropping it, they'll most likely say no since it's too late to pick up another AS.