it depends, on a number of factors:
-how popular the course is
(a less popular course could ahve a UAI cutoff drop)
-if you can apply for the EAS (Educational Access Scheme)
(this means you will be competeing for a spot in the course with another pool of students if you are granted EAS, adn the course is covered by EAS)
-you could do another year of uni in another course and then try to do very well in it and then transfer into the course you want
(not exactly an easy task, my mate was at UWS in first year, aced everything and then transferred into USYD and is like scraping passes, the expectations change, and it is often pretty hard to get a transfer even between courses)
so i would suggest, study hard, apply for EAS and then have a good second/third choice of course, Oh it helps to have a look at the SAM (UAI calculator) but keep in mind that it will be a few point off, in my day mine was about 3pts lower than predicted when i put in my actual scores
dammit, did not read the spaces i put in