really, the choice is up to you about chosing your subs.if you've made a decision this early about your subs, shows that your a keen student and are interested in those subs already
i started with your subs (well, not economics, i did bio instead thats all) and i thought they were okay. what got me was vietnamese. i've been doing viet since kindergatern till year 10, but when i went into the class in year 11, i had to back off. i was born here and obviuosly, i dont have the native tongue, but my skills in reading,writing, responding were well above average and expectations. it might work for you, but personally, in my class, there were
way too many international students, and i couldnt really handle it because theyre be cracking viet jokes and laughing, but i wouldnt find it funny- it wasnt only that, but the work just got boring. its the same topics as i did in year 10, just theyre more strict in marking and how you express yourself. maybe it was just me. i did it on a saturday so it was a hassle for me. i found it rather irritating starting at 8:30 on a saturday but if youre committed, then do it
i lasted for half a term, then i changed to religion at my school. when i changed to religion, it meant i could bludge for that 1 unit because i knew i was going to drop it anyway-so i slept in class
for chem/phys, do you like science now? because if you dont, then you're making a big mistake. phys/chem are a demanding course and they dont come easy. i see so many of my friends dropping one or the other because they cant handle it and end up risking 10 units.
3 unit maths is a demanding course too. i think maths is one of those courses that you just cannot lose or keep out of touch with. maths needs constant revision and practice and because ur doing ext 1, i'm assuming you have your eye on ext 2 maths. you need to work yourself a fair bit for ext 1, imagine ext2.
english adv is really for you to take a challnege. there is no easy way out of it and there is more ground covered in the adv course than they standard course.
you should ask around for people's opnions on the subjects they do because different people will have different things today. i can so see many people reading this post and saying "omg, maths is easy as pie" or "chem is soooo berlard hard, dont do it" etc.