Its been a long time since I went to oasc but not so long for wearing a green suit.
After UAS and a degree I was rapidly approaching 23.This was the rules as i was told it much like above.
Apply for selection before 23 .After passing you need to be walking through the doors for IOT before you turn 24.
I seem to remember the OASC scores were only valid for 12 months anyway before you came of the pile.
Apply, Pass and see what you get offered (only except pilot).
Good luck to you all