There are a few things that work for me, some of which I have taken from the forums haha. First, you should identify the biggest and smallest which is usually easy to do. Then cross out any answers that dont correspond. To differentiate from the middle two I do the following (keep in mind which way the angles might be facing - vertical/ horiz/ left/ right, and how different the legs sizes are):
1. I try to fit the smaller angle in the bigger one (this is tricky if one angle has two small legs and the other has two long legs b/c you will be tempted to think the smaller leg angle fits in the bigger leg angle)
2. (got this from someone who wrecked the PAT and it works for me) pretend they are peoples noses and see which one is less favorable
3. (got this from the same guy) pretend they are hills and think which one would be more risky to go down
Hope that helps! if not, just go quickly b/w the two that are unclear and make a choice. Staring at it for hours probably wont get you anywhere, with so many questions on the PAt you gotta move quick