try picking 2 or 3 specific angles, or shapes and see if they fit or not. Most of the time, it is just a subtle difference that will show you that it is or is not the correct answer. One of the best ways of answering the question is to eliminate the answers this way. After a while you will be able to pick out the answer fairly quickly. As always, with PAT, the best advice is always: PRACTICE, PRACTICE, PRACTICE!!!!