I loved GCSE chemistry, I got 100% in a few of the chemistry modules, but I have a tendancy to like things I'm good at. Came out with an A* in science overall, but I hated doing double award science, would have preferred a triple one.
But anyway,you just have to graft. Personally I loved chemistry, but detested Physics which if I didn't graft at as well I would have come out with a lower mark which would have reflected badly on my chemistry.
Set a time to study, put an alarm clock on on your phone or even in your bedroom, and then work really hard for a certain period of time and reward yourself after. No distractions. It goes quite quickly, surprisingly.
But I can guarantee Chemistry at AS level is much better, in my opinion anyway :P. Think that in a year or so that it will all be over and you'll be happy for working hard as you'll have the grade as the reward, no matter how unappealing it will seem right now :P