What you have to remember is that in college there are no such things as 'core' subjects. I take 3 sciences, but I'm good friends with people who take art, and BTECS.
Another thing to take note of is that, that a large percentage of employers who have a preference, prefer science-based A-Levels because they are 'harder' ( by which I mean they require you to think in a completely different way to how you usually would, so you develop other skills too ).
Similarly, college lessons are VERY different to school. I hated maths in school - but LOVED it in college. It's a completely different atmosphere and that can make all the difference. The teachers treat you like equals not inferiors. If the only reason you don't like Maths or Science is because of a teacher - you might find it changes in college.
History is a good A-Level to do, and some colleges offer things like archaeology to go with it (Geogrpahy is good too ). The thing you have to be careful of when picking 'new' subjects is that they may not cover what you think they will. Almost every AS student in my college picks Psycology - there are 3 or 4 lesson blocks packed to the rafters to meet the demand. But by A2, they have realized it's not for them and most of them drop out. Health and social care, as far as I am aware, is a BTEC and if that is the case you will only be able to take one other A-Level alongside it. BTECS are easier, because they do not tend to have exams, and you can often re-so the coursework - but there IS a LOT of coursework, and they can sometimes be seen as worth less than traditional A-Levels.
Don't forget - you can usually pick up to 5 AS-Levels, and if you don't like them within the first half term, you can usually swap to another subject, or drop out entirely.
I found when picking my A-Levels,I looked at university courses I wanted to do and worked backwards. I wanted to be a vet, so I knew I had to take Biology, Chemistry and at least one other ( preferably science ) subject, so I took Physics, Maths and Animal Care. I dropped out of maths at AS because I didn't have time for it, and because I found Physics more useful anyway.