Hey, you do "English, Maths Specialist, Physics, Biology, Chemistry", awesome. I also did Eco and Extension English in Year 11 though.
3Unit Maths was "a pain in the ass" for me at the start because the workload was approx double the previous year's but when I got used to it, it was okay.
Advanced English was approx 1.5 the amount of work than Year 10 (it's like squishing one year into 3 terms).
Extension English was hell because it was approx double the texts I would have to read for Adv. Eng. The independence expected of students was just ridiculous imo. I regretted it as soon as taking it and did not finish reading all my texts, hence theoretically I was screwed to the max for the Yearly. Luckily I was allowed to switch to Physics.
The Chemistry workload was okay despite it being more than Junior Science. I didn't take the first three terms seriously though and did no work back then. Then I was like "shit, I don't know this stuff *studies*"