Haha good stuff b^3 
I'm taking:
MCEN30018: Thermodynamic and Fluid Mechanics
ELEN30011: Electrical Device Modelling
ELEN30012: Signals and Systems
COMP20003: Algorithms and Data Structures
ECON10003: Introductory Macroeconomics
Better not come back next semester have my grades drop 30% haha. Thank god I have all of the lecture notes / tutorial sheets already. Wish me luck!
If worse comes to worse you can always save the semester in swotvac. Although don't get lazy ever, throughout the whole semester, even in week 1. You'll kick yourself later on when you have assignments all over the place and up at 4am trying to get them done on the day they're due

(not saying you're going to be like that... lets just say from experience

)
At least it's not 5 eng units

Guessing macro will be a bit lighter than the others? (although I did a macroeconomics unit last year, absolutely hated it).
EDIT: wow, I use

a lot..