+1 for choosing what's fun.
My experience in Sydney: Elec eng uni courses are tailored for students from a wide variety of international education systems. The first year teaches you anything you missed. Knowing a little calculus before hand is useful. I suspect most undergrad uni courses in Aus will be like this.
Useful primary and secondary info sources: Find who's teaching the HSC subjects, see if they're teachers you think you might be compat with. Download the course dotpoints from the board of studies, have a read of them and see what the assessments are like.
Find the fun stuff, avoid the teachers you know you will have troubles with. If people recommend you a course (or tell you that you 'have' to do it) based off just the name/area of the subject then ignore them with prejudice, they think choosing an HSC subject is like shopping at the supermarket.
You are the only one sitting the next 2 years of HSC, not your parents. If they demand you do a certain subject then ask when they plan to sit the assessments.
I really enjoyed chem, but that was also down to a great teacher who loved her stuff. I didn't do well at all in 2-unit maths, and I still want to blame the classroom having an unvented gas heater and the windows always closed (
), but otherwise I've been fine doing elec eng at uni. Never did physics, again not a problem, everything covered in the uni course.
I only wish I could have done more HSC courses. And perhaps drop English