Mmhh i see. I guess im just upset cause our school sacs were pretty hard and lengthy I thought that performing much better in the exam would say something about our sacs.
This is technically true- your SAC average (i.e your GA1 mark) can scale up is you do well on both exams
Do you know students at your school have done in previous years if you had students get into the 40s with 70ish sac averages you may still be in the chance?
My brother who is in year 12, is in the same boat as you he's near the top of the ranks but his sac average is around the 70s as well.
But this is out of your control all you can do is to do your best in tomorrow's exam and get the best score you can.