You don't need to prepare for it. Just show up and you're hired. The questions are no-brainers. You might as well staple your resume to your forehead. That's all you go over. What's your experience? What's your preferred schedule? What size shirt do you wear? If you're a warm body, you're in. If that doesn't tell you all you need to know about the company, you are the perfect candidate! Run away if you have any self-respect or intelligence.