How much reading time do you get in the actual UMAT? Is it 10 minutes? Also, aren't the sections scrambled up in the UMAT, so you can't go about doing it section by section? I guess it;s easy enough to recognise which question belongs to which section but then you run the chance of shading in the wrong bubbles.
Yes, 10 minutes.
Yes, the sections are scrambled.
I only noticed after doing the ACER test but I'm pretty quick by section and pushing for time when they are scrambled. For that reason, I think I will approach it by, as you say, recognising which question is which.
The risk of shading the wrong bubble is there. The other risk with this method is that if you run out of time and you've only done two sections, the last section you attempt might have be affected negative due to nerves/not being able to finish on time. And that will jeopardise admission chance into 50-50-50 universities if the score is really botched.
My solution to this would be appropriate time management. After each hour, even if you're not done with the section you're on, you should move on. That way you will attempt every section to a reasonable extent.