Do you go to a library where some noise might occur? Do you stay at home with ear plugs and no one else home? Do you use mechanical pencils or wooden pencils? J.Y. said that when PTing we should simulate testing conditions as much as we possibly can. This ranges from possibly using the room we may take the test in, to using wooden #2 pencils instead of mechanical (which sucks because mechanical feels so much better in my hands).
If you're studying to retake the exam, what felt out of place on test day? Was it random noise from other people? Did they make constant noises such as erasing, ticking off answers loudly, or whisper to themselves? I'm curious, because these were my problems, and although they did not fully contribute to my poor score, I feel the noises played a part. Also, in my opinion, a good portion of the test is being able to stay focused and not get irritated/unfocused when people are doing quirky things.