This is a crucial ability and of course a successful teacher will be able to manage groups of pupils by the carrot, only needing to resort to the (metaphorical!) "stick" as a last resort.

Good organizational skills, self confidence, a robust personality - able to take criticism, maturity, presence, a sense of self confidence and a sense of humor are the qualities that will help you to manage a class without too much conflict.

Give some examples, if you can, of related situations you have experienced. Have you been involved in any other types of group work that could be described as similar? How do you know you will be able to manage/discipline unless you have already tried it? What kind of presence you have and how loud your voice is could be important.