I haven't taken the DAT yet (3 days!), but TFE is one of my stronger sections on the PAT, so I'll chime in. Like everything with the PAT, this section is all about exposure. If you go through enough problems, you'll start to pick up on patterns. For instance, you'll quickly be about to recognize when something has a cutout underneath and recognizing a detail like this can help narrow down your choices. I know people say you have to visualize the entire shape, but I don't think you do. Again, it's more about recognizing those key features that will appear over and over again. I'd suggest taking the tests timed first and then redoing the TFE section without looking at the solutions.