Judging by your current options I'm assuming you trying to get into med if that's the case I'd go for an essay based subject as that would make it easier. Perhaps you could choose psychology as I think it's an easy A-level and has quite a lot of overlap with Biology from what I hear so that could make them both easier. I'm not sure if med schools would accept sociology as a subject.Though all in all just choose the subject you like as it would be better for you to do something you like ( even if you do something easy the overall experience would just be extremely boring). Anyway good luck with choosing options and I hope you get amazing results in the subjects you end up choosing