well tehres limits on the nunber of people on any course, tehy want a certain number of people doing hte course, so they admit the top x students who want to do taht course, and the bottom person's uai is known as the cut-off
at mq i think in 1st year we have something like 170 odd actuaries
the number declines as the degree progresses
im not sure bout nsw, but for actuarial, u should consider macquarie, as it has the more reputable actuarial program
if u really cant see urself as an actuary in the years ahead, but just want to try it out and see how you go, i recommend you go to nsw, as u have options if u decide to drop it
otehrwise you should really aim for the macquarie actuarial degree
n.b the only unis that offer actuarial are Melb, NSW,Macq and ANU...i think theres another uni with a n00b actuarial program, but i forget...