The Psych mid-year is coming up soon and I hope you all do well and I'll probably think of you as you're completing it.
Hopefully you're feeling confident and you more or less know the course. If not, don't fret, there is still time left.
If you know the whole course off by heart, there is a limit to what else you can do (is that a relieving thought?). Keep revising your notes every couple of days to maintain the same level of knowledge, do as many practice exams as physically possible and try to make your revision interesting - posters, lecturing your stuffed animals with no notes, etc. Invariably, on practice exams you will get questions wrong. Look back on these questions and analyse exactly what you did wrong. Is there a gap in your knowledge? Is it more to do with exam technique? Make sure you understand why you're getting it wrong and then write down what you've learned from it, also make a lists of the little obscure bits of information you pick up as well as more troubling concepts. Review this list. There isn't really any point to practice exams unless you're drawing this kind of thing from them.
It does well to remember that with Psych, as with any subject, just knowing the course is not going to earn you a perfect score, you have to be good at applying your knowledge, which is a bit more difficult (and difficult to discern whether or not you can do it).
All the best!!