Yeah, they only use it if your results aren't where they are supposed to be relative to your internal mark. You will need your doctor to fill out a form though, and your principal, and the head supervisor of your exam - so it's quite a lot of paperwork.
I couldn't agree more :/. I'm the only one doing ext.2 at my school so i've never really had anyone to work with or compare myself too. Still, i'm guessing most of these people go to Sydney schools? That makes me feel better :P.