some centers are more strict than others, although the rules should be universal for every center to make it as fair as possible. the place my friend took his exam... they were very strict about holding anything up to the screen let alone even touching it... whereas at my testing center, they never mentioned a thing and did not seem to mind. if it is angles you are worried about on the PAT, then i would suggest doing more and more of them to become accustomed to using just your eyes. you should get to the point where you only spend 5-10 seconds per angle problem.