VCAA has it's reasons.
"VCE results are scaled because individual study scores are not an
absolute measurement of overall performance.
On behalf of tertiary institutions, VTAC combines study scores to
form an aggregate (total) which is then converted into a rank called
the ‘ENTER’.
Before study scores can be fairly added together they have to be
compared and adjusted. This is because students take very different
combinations of VCE studies, and VTAC can only legitimately add study
scores together if the strength of competition in each study is about the
same.
For example it is unfair to compare the best and fairest of an
individual football team with the best and fairest in the national
competition. Scaling overcomes this difficulty and ensures that each
study contributes equally to the ENTER (that is an ENTER subject
score of 25 in English is equivalent to an ENTER subject score of 25 in
Psychology or an ENTER subject score of 25 in Chemistry).
There has always been a scaling process in Victoria and other
Australian states. Prior to the VCE it was not discussed, it was
embedded in HSC scores and did not receive much attention. Now
the process is transparent. In this way, you are not only able to see
your performance within each study, but also how you rank for
tertiary selection compared with other students."
In the Specialist Maths case, the same reason applies. Should a 50 in further maths equivalate to a 50 in Specialist Maths? VCAA is asserting that students doing Spesh who do just as well as a person doing Further would be disadvantaged, or why would the student choose Specialist Maths, and get a 38, while he can choose Further and get a 50?
As the purpose of VCE is to rank students top to bottom per se, it shouldn't be that students who have a specific adroitness in maths should only be compared to those with the same aptitude, while people who are not necessarily the best at maths being ranked only in their category. I hope I make some sense, and having witnessed a lot of situation like yours, I do believe that it is unfair to some students, but the VCE s all statistical, and up till now there isn't any resolution that would make it fair for EVERYBODY. If we cancel the scaling, that would make it unfair for people tackling the harder subject, as they wouldn't be justly compared with students taking "easier" ones.