I did 10. If I had of done 12 I would of had a breakdown I'm sure of it.
I hardly ever used my free lessons to study, a bit of the tiem i would use to do my major work for ind. tech, but that's what I needed to de-stress, those 6 relaxing frees.
I only stuffed up one exam, which was the 1st english exam and that was because of my nerves, it prolly resulted in me getting a band 4 insted of a band 5.
And the only thing that stopped me from getting a band 5 in maths was my shitty maths teacher, so insted i got a band 4 also.
But yeah, if 12 units gets to much for you, speshlie if you have a major work to do with one of them, drop a unit or two.
If I did 12 units I think I would have done worse in my HSC. I got 78.5 which i think is alright, and i'll get into what i want to do easy.
and also, I dropped chemistry after one term of yr 12 work, my marks where 76 eng, 77 math, 82 pe, 83 bio and 90 industrial tech.