You should really base your choices on what degree you want to do not the other way round... what do you enjoy doing and what career do you want? With those as a set you could do History, Law, Geography, English, it would be something along those lines.
Maths is quite hard at A-level but it depends on the person, if you want to do History/Geography/Law then R.S. would probably be more beneficial to be honest, especially if you hate Maths...