There was no interview. I asked a professor whom I had a class with if he needed a grader so I could keep in touch with him and the area of study (since it was different from my major). There is typically an interview, though, and you need to have had at least a 3.5 in the class you're applying to grade for.
Interview questions [1]
Question 1
What is your schedule like? How many hours a week do you need/want? Are you a work-study student?