Welcome! Do you mind giving us a brief comparison of SACE with VCE (If you happen to know about it?)
Like do you guys have 1 end of year exam for each subject, and sacs consist of the other 50-60%? Are the study designs similar? Etc... just so we get a grasp of your system so we can relate stuff to you 
In SA:
For Mathematics/Sciences:
Skills & Application Tasks (i.e. In-Class Tests) = ~40-45%
Folio Tasks (i.e. Practical Reports, Investigations) = ~25-30%
Exam = ~30-35%
For English Studies:
Shared Studies (Text Essays) = 30%
Individual Study (Individual Paired Text Response) = 20%
Text Production (Orals, presentations etc) = 20%
Exam = 30%
I have no idea about VCE sorry.
Spec = Highest Maths
Studies = 2nd Highest Maths
English Studies = Highest English