I'll try and help you out with some raw marks with what I got in my Mathematics HSC:
Assessment Task 1: ~55%
Assessment Task 2 (Half Yearly): ~50%
Assessment Task 3: ~55%
At this point, I was ranked ~40/65.
Assessment Task 4 (Trial): 75%
After the trial, I was ranked 23/65.
I go to a school ranked ~130, ended up with a HSC Mark of 85.