It is normal to be nervous.
You can sightread better if you know your scales and arpeggios.
I think it is most important for a teacher to play the pieces and studies that are being played by the student.
You cannot prepare enough for anything.
The quickest way to unlock your talent is to take the flute out of the box.
I do not consider my self as having mastered the flute, but I get a real kick out of trying.