I'm about as green as pilots come but I reckon that there's a time and place to save trees and a time to kill them. Whilst you are sitting an exam for which you have shelled out $180 is no time to save trees (or whales, wombats, bilbies for that matter). Use paper and use lots of it.
Also, when you get a second sheet DO NOT let them take away the first (they didn't even try with me). They've got no reason or right to do that and you may well need it for going over an earlier question (although you should be damned certain about changing an answer as your first 'guess' is usually right).
FRQ CB