questions about law

I've always been quite undecided about what I want to study at uni (for context I'm from Scotland in in my final year in secondary school). I've always done a broad spectrum of subjects, so have really kept my options open but kind of veered towards sciences. Recently I've been considering law. I have the Higher grades for it (AAAAA) and Higher English which is all that is (mostly) required.
However at the minute I'm doing AH Bio, Chem and Spanish as I enjoy them more than anything. I'm wondering if I should take up a Higher like Modern Studies and if it would help me at all, either for background knowlege or if it would give me an advantage getting in? I'm also wondering if there is anything additionally that would help me get in?
Thanks!!