What would your teacher/former colleague say about you? (Reference-check is pretty common in this field of work. If you get this question in an interview, there is a good chance that they will actually call your former employer, or even a teacher, and ask for a feedback on your work, or on your personality. Try to stay humble, do not exaggerate. Say that you know that there is always a room for improvement, in everything we do.)
When can you start? What is your availability? (Try to show some flexibility in your answer. Study the shift patterns in the place. Are they open on Sundays? Late in the night? Show them that you did your homework, and understand what it takes to work for them.)
What are your salary expectations? (Try to do some research prior to the interview. Learn how much people earn at the place, or at similar places in the city–you can find the information online. Try to be realistic in your expectations, and ensure them that the salary is not the deciding factor for you.