There is just so much theory to remember, i just cant do it?
Yes you can!! Seriously! I know it sounds so cliché but don't tell yourself you aren't capable, positive thinking does wonders

Chances are if you've been to majority of your classes, you probably know a lot more than you think.
Plus, remember who you're against. Out of all the people who do psychology in the state I am HIGHLY doubtful that even a fraction would say they are confident in the whole course. Of course there's a few students who will have probably been doing practice exams since the start of the term, but they make up such a small percentage of the overall psych student population it really isn't relevant.
The fact that you're even on this website shows you care about your score, which is more than half the state can say.
Just don't get down on yourself now

less than a week to go and this will all be over! Keep revising and do those 4 practice exams you have. If you want more, print the VCAA ones from old study designs but ignore the parts about learning, etc. Practice makes perfect so going through the VCAA papers are definitely the most useful tool for you right now.
And for the record, I'm in a similar position to you - I've been really unwell the past few weeks and haven't gone to school or studied. Only began practice exams three days ago so we're not far off each other.
Good luck

you can do it!!