Hey ally_teoh,
I think it fluctuates a little each year so I think there could be a chance, but I have no idea what the cut off will be like this year sorry.
However, even if you don't get in it's possible to transfer into bachelor of psychology after a year of studying something else, if you get a 70+ WAM. You could pick the same subjects that are done in first year psychology in a science degree, (or some of the same in arts degree) and then apply to transfer courses. Transfer isn't guaranteed with a 70 WAM, it depends on the places available though, I think higher WAM would give more chance (?).
I got some of the info from here:
https://www.monash.edu/course-transfers/course-pages/woo-mango?course_id=2066128 (it doesn't really say much else, it's just evidence that it's a possible option for you).
I really hope you do get an offer this year, best of luck!!