I'm kinda in the same place of you.. I'd like to pursue a career in law, but I'm taking the International Baccalaureate... here are my subjects: English (higher), French (higher or standard), Psychology or History (Higher or standard), Maths (standard), Physics (standard), and Chemistry (higher). If I took a-levels I'd do all of them apart from Chemistry, and I'd only do maths to AS (I did some AS levels early)...
hope this helps... Universities just like essay writing subjects, and ones that show you know how to argue well, as someone stated above- History, Philosophy, and Psychology are all good. It also depends on whether you'd like to specialise in anything; I'd like to specialise in Medical Law, and therefore am taking two sciences (I have to take one anyway haha), and Maths (also have to take this:L).