Well when I play for concerts I always practice my piece in front of other people. This helps you get used to an audience. I imagine that the audience is really stupid and will not notice if you play a wrong note. This really helps me to relax. Even realistically not everyone in the audience is going to be a piano virtuoso so theres no need to fret over tiny details.
I always imagine my examiner as my piano teacher then just perform the piece how I would normally.
I hope this helps.
Does anyone else have any tips