meh i got 35 for the independant trial (changed version) i'm 3 from 3.
I think software is abit like music praticals you can do some much pratice and work and sometimes it comes down to how you do on the day. espically with the algorithms.
dont be too deterred. i think i got around 50-60% in teh csaa trial last year and got 78 in the hsc. and that to after the fact that i didnt study for it at all (had ext english the next day i think) as it was my extra 2 units.