Depends what subjects you do. I did maths, maths ext, adv english, chem, physics, japanese cont. My SCALED marks were 70's for every subject but maths (80s)...so raw marks were less than that... and I managed 80.90 UAI. I had good scaling subjects which did save me somewhat. If you do humanities or artsy subjects you are going to have to get something close to 80 in all.