I've done no courses before no however, I am only 22 and got an ENTER (I live in Melbourne) of 86.3 which is really quite a good score.
I assumed they wouldn't take ENTER into consideration considering its been 5 years? I'm hoping they do as it would give me a chance!
Definitely crunch some numbers and see if there's anyway you can do it! We Only live once, and I have been thinking I don't want to be on my death bed and regret that I never followed my dreams!