You want to ask your teacher for extra help so you practice in your mind what you will say this is an example of

role-playing or mental rehearsal

role-playing or visualization

This is an example of visualization. Visualization is a mental process where you imagine or create mental pictures of a situation or scenario. In this case, you are imagining and practicing in your mind what you will say when you ask your teacher for extra help. By visualizing the conversation in advance, you can better prepare yourself and feel more confident when actually having the conversation.