I'm a philosophy major, so can probably help you out but I'm in the car right now. Typical questions would be: Existence of god, Mind body relationship, Descartes' meditations, Ethical theories such as Utilitarianism "does the end justify the means?", I wouldn't recommend Berkeley's tree in the woods if you haven't been taught it by a prof. Stick with ethics of you don't have a ton of background i'de say.