DO A 3/4 IN YEAR 12!!!!!! I did one and obviously I didn't take it too seriously (33 SS). BUT now I know what I have to do in year 12 to acheive a high mark as apposed to those that are having their first exams this year. I would advise you do any subject you enjoy. Avoid the 'hard sciences and maths' (I apologize for saying hard but I have no idea how else to describe them). Maybe Bus-man or legal???
Same perspective, i kind of messed up mine but at least then i knew what i was in store for in year 12.
Anyway, there is pretty much no disadvantage to doing a 3/4 in year 11.
I was double lucky, I did IT 1/2 in year 10.
There are two kinds of IT, Apps and Software Dev, so i could do both of those 3/4 units off the single 1/2, that way i didn't need to pick up a 3/4 blind in year 12 or mess around with dropping this or that.