My daughter auditioned this year via zoom for the year 8 program. We were emailed with details on what to wear. I think it was a leotard, ballet socks and her flat ballet shoes. Hair was well groomed into a bun. She did some warm up exercises, lots of work in the centre, improvisation to a Piece of music she recognised and exercised based around flexibility. They spent some time talking to the participants and relaxing them.
I don’t know the answer to the other questions sorry.
Good luck to your lovely daughter. My daughter really enjoyed the experience x