What do want to do in the future? and what do you enjoy?
In fact the latter question is far more important. I'm the same as 'HighwayUnicorn' I picked subjects that were respected to get me into a specific career that I wanted at the time, but picking subjects that perhaps I don't enjoy has made it very difficult for me to do well in them. So pick something that you really enjoy, remember you'll be doing four in total so a lot of time will need to be spent on each, so spend your time on something that you have a passion for.
Noone here can pick your A level subjects, they are for you to decide and noone else, it is an important decision, for two years of study, so it is important that you pick it, noone here knows what you are capable of and what you exel in, so the decision is totally up to you! Good luck!