Your logic is interesting.
Because nearly anyone can pass the HSC as well.
In HSC, they rarely give out aligned marks below 50. (if that's what you assume it to be "pass")
Only few one digit per cent of the entire cohort gets something below 50 aligned marks.
Your mark in VA would have been fairly high (assuming that you got Band E4 for Mathematics Extension 2 because you are doing a Distinction Course).
Are you the one who state-ranked in Visual Arts (9th from what I see) from Kambala?
How much do you spend on each maths (in terms of percentage/hour of your whole study time/maths study time):
4 unit maths
3 unit maths
2 unit maths
1. 4 unit maths = 1 hour = 20 % of my whole study time = 50% of my maths study time
2. 3 unit maths = 1 hour = 20 % of...