I'm pretty sure extension subjects have different bands that range from E1 to E4. Don't quote me on it though. But from that, obviously E4 is the highest, with E1 being the lowest.
I would say the Board of Studies would have some sort of criteria of bands for extension subjects, and they would be much, much more reliable than I could be on extension bands haha.
yea it is different
also to OP i understand QLD has 3 math levels
A maths
B maths
C maths
in NSW we have 4 levels of math, NSW offers an extra, more difficult course according to my careers advisor.
general maths
mathematics
mathematics extension one
mathematics extension two
the levels go together like this
A maths (qld) = general maths (nsw)
B maths (qld) = mathematics (nsw)
C maths (qld) = mathematics extension one (nsw)
beyong QLD secondary education = Mathematics extension two
i live 30 mins away from qld and so i am considering going to a qld uni. so i ask my career advisor about ur education and thats what he told me about math. hope that helped