Last year, Michael (jetblack2007) was the obvious dux. He achieved E4 in MX1 and MX2 on an accelerated program. He then proceeded to get Band 6 for Advanced English, Biology, Chemistry, Music 1, Studies of Religion 1, E4 for EX1 (I think) and High Disctintion (1st place) for Cosmology.
This year, everyone in our grade is confident that a certain student will get dux. In the prelim year, she came first in Mathematics, MX1, Advanced English, Chemistry, Physics and CAFS.
I guess what I'm trying to say is that there is just a huge gap between the very top student, and so it's hard to observe whether our dux is based off amount of ranked places they receive in a subject, amount of band 6s or their ATAR.