For those panicking or upset, I just want to share my own UMAT experience - I completely misjudged the time and therefore when they told us to stop working on section 1, I still had about a third of the section left, so I ended up filling in the circles randomly. Section 2 I left about 5 questions unanswered; section 3 (my weakest) I left about 5 questions unanswered and at least 10 questions were totally guessed because I am reaaaaallly bad at it. I still got a high enough UMAT score to get an interview with Monash (granted, the cut-off was a bit lower back then).
What's done is done; relax, reward yourself for getting through this pain in the arse of a test, then forget about it and get back into your exam revision.