12 units seems good
cause you can stuff up in something and still get a good mark. you can do this with 11 units but if you stuff up in a whole subject you include 1 crap mark inur HSC
btw im doing 14 units
if your happy, go for it
yeah... im one of the suckers also doing 14 units...but im doing my maths this year so only 11 units in yr 12 so its a bit easier for me.
'fraid thats not much help to you...