no. you're exam mark is your own. VCAA simply adjusts the Sac marks of your entire cohort depending on how rank #1 did on the exam.
So if rank #1 screws it, s/he brings everyone down with them.
Not true. What _avO said is correct.
serious..?? u bring good news :]..
so how does it work den?
Raw internal SAC marks are used to determine rankings of the students within that subject cohort - the raw marks themselves don't mean anything, just the ranking. After the external exams are done, the raw scores from these are lined up in order. The person who scored the top SAC ranking inherits the highest ranked exam mark as their moderated SAC mark. Person who came 2nd in SACs gets the 2nd highest exam mark as their moderated SAC mark and so on and so forth. There's a bit of fidgeting with the numbers on top of this to further moderate it according to a school's GAT average apparently, as well as perhaps some other factors, but this is the gist of it.