Personally, I wouldn't rank Latin as high as some of you guys might, I personally believe Chinese would be more difficult. Keep in mind that languages like English and French have Latin roots, meaning that speaking one of (or both) languages may result in learning and performing well in Latin becoming easier, whereas having no background in a language like Chinese can make it much more difficult to learn, and subsequently take as an HSC subject. My top list doesn't take into account science subjects mainly because I only took 1 science subject, and dropped it at the end of year 11, but it does consider HSIE subjects.
My personal top 10 most difficult subjects (including languages):
- Mathematics Extension 2
- English Extension 2
- Mathematics Extension 1
- Chinese
- Latin Extension
- English Advanced and English Extension 1
- Latin Continuers
- Economics and Legal Studies
- Mathematics Advanced
- English Standard and Mathematics Standard
It's quite difficult to limit yourself to 10 subjects but this is what I think