Mainly talk about your own achievements, how you did during customer service, where you ranked, and why you were promoted, because you worked hard and worked hard.

Being a supervisor for 3 months, how did the team perform, how did everyone evaluate it, and what management knowledge they learned;

Can train, can schedule, just talk about the results of doing these things.

Not only what you have done, but more importantly, what are the effects and achievements of these things you have done.

Wish you success!