Oh hey, I'm applying to do UMEP psychology as well

It actually says you need an A average for your subjects to psychology. (No idea why it's different for psych) D: Anyway, I would advice against changing them because as Nova said, it's wrong. What do you think you're going to average (remembering that it's across your entire report so even if you screw up a subject it might not matter as much)?
Instead, why don't you just mention how passionate you are about the subject and how you
really want to do it etc. etc. Just emphasise on reasons why you want to do it, how it'll benefit your studies and write a kickass statement.
They can't really check with VTAC because you don't get graded for Unit 1/2 subjects. VTAC would only have whether you got a S or N and not letter grades and you're supposed to hand in your VASS report anyway.