@jlogan278 The proctor will ask you to momentarily stand in front of a mirror holding your laptop (or I guess you could hold a mirror to the laptop if you don't have one on your wall) so that they can see your screen and keyboard.
I would save them until the end or until after you get some analytics from your PTs. I think they are moreso just a shortcut for reviewing specific question types after the fact if you are struggling on a question type.