Hello all!
Gowland19, I've been exactly where you are now (all the same subjects bar further maths, where I did electronics). I did all my exams on the WJEC, and found the second year of chemistry much harder compared to the first year. Round about christmas time, I came very close to dropping it, but I decided to carry on but pay much less attention to it.
If you carry on with it, it doesn't necessarily mean you have to get an A or A* in it, you can still get your 3 As or A*s but with an additional A level in chemistry. (any A level is better than no A level!) If you get a C or B, without stressing out too much, even better!!!
I am at this stage now, (I am around 20 marks away from a C), therefore if you carry it on, all the work up untill now isn't so much of a 'waste' and you can still get the grades in the subjects you need.
But the decision ultimately, is yours.
Good luck with your exams and I hope this helps!
Cheers
Dan