I'm not an American or an expert on American higher education, but in terms of preparing for law school in a sensible way, it seems, like other people have said, a good idea to study some philosophy because the approach to texts in analytic philosophy and law seems to be similar - on a somewhat abstract level (i.e. pretty different issues but the overwhelming attempt to textual detail might help). Some of the subject matter of philosophy MIGHT also serve as a precursor to some of what practising law is about, namely the legal, moral and political philosophy - so you might just see if you like some of it. Even if by far the most lawyers are obviously somewhat removed from abstract philosophizing over theories of justice, I still think it might be a good idea to be introduced some principles of law that you might come to like and use in the development of your own sense of "right", "wrong" and "fair" (which I hope that people seeking careers in law have at least a peripheral interest in).
Also: apart from that, I'd take courses on criminology, public policy, accounting, international relations, social justice etc. (or whatever most closely aligns with your perception of yourself as a future lawyer [i.e. corporate tax expert vs. civil rights bannerman]). And perhaps quite importantly, I'd try out some rhetoric, communication studies and English courses focusing on oral presentation because law is one of the few remaining professions, along with that of priest/pastor, in which good oratory is still a key skill (obviously, try to take some courses that focus on concise writing as well - i.e. not literary essays, but perhaps more indepth philosophical analysis or the like).
god damn stims. hope this helps.
EDIT: also, apart from actually knowing the law, being a lawyer is about being persuasive. Practise that.
