You want to ask your teacher for extra , so you practice in your mind what will you say. this is an example of eustress distress a stressor a mental rehearsal

a mental rehearsal

Explanation:

Mental rehearsal is a technique that helps the individual prepare for a specific situation they will experience. It consists in creating a scenario in the imagination where we find ourselves facing that situation, adopting the desirable behaviors for good performance and achieving success.

This technique is especially recommended for times that generate fear and anxiety and when you need to do well. An example of this can be seen in the question above, where a student wants to ask the teacher for extra help to practice in his mind what he will say.