If something like this came up on my DAT, I'd for sure guess, mark, and move on. If I had time to come back to it, I think the only thing I'd be able to do is go straight to the answers and check backwards. In cubes, they can only show you three sides. So the question becomes, "can the three sides shown in this answer actually be arranged like this?". So, you go back to the unfolded picture, and look at the three sides they're showing you in the answer, and see if when those 3 sides come together if it works. The only problem here, is that there are multiple sides that are similar, so you have to check each answer through multiple orientations, which is annoying.
That's probably not the best method, but it would be mine right now. I'm curious to see what someone else would say here that killed the PAT section recently.