I am horrible at standarized tests and I have two bits of wisdom: 1) never change your answers 2) develop a system in which you randomly pick an answer - e.g. my system is/was after eliminating choices I knew to be incorrect I would pick the first one left standing. For example, if I could rule out B and C from a list of A, B, C, D, and E I would thus pick A if I was stuck between the remain three choices. My reasoning is that I stand a better chance of guessing an answer randomly than if I debate it without much more to go on than a hunch (which never works out in my case). As a matter of fact I did have some luck with that system and those are two ways that I felt I could ease some of the test anxiety.