This is a really good point MM! I always feel nervous when I have a new student and think (know!) that they are judging me on everything. The best advice I would give to any student teacher is to make sure you drop some compliments in during your first couple of days. Students often feel that the class teacher will be so confident about everything, but really we know that you are going to spot things that we are doing wrong. A few compliments about displays, children's behaviour and teaching will serve you very well when it comes to your mentor feeding back to you!