Ahh yeah, you've got to get a suit for job interviews, work meetings, court appearances, even mock trial appearances. You'll have to suck that one up.
As to the original post, please don't read a bunch of law stuff in advance. If you have no poly-sci background, then maybe some basic materials on how our government and court system work. But don't read a bunch of torts cases or try to memorize contracts rules way in advance.