Just practice, practice, practice. For the TFE, try to look at ways to eliminate the other answers by looking at the different pictures. Like if you have a box inside of a box, you know that there is either a hole there, or there is a cube shape coming out at you. And usually, you can figure out what it is if you look at the other angle. Don't try to visualize the whole image or what it looks like, just look at certain sections and get to your answer by elimination. But really for PAT, practice makes perfect so you can get better at it.