I concentrate much better with tunes playing in the background or via headphones; partially because my ears ring if there's not some type of 'white noise', and partially because it helps me fully ignore everyone around me rather than zoning out like I sometimes do. I've got ADHD, so having something to keep me focused usually helps – thus why I'm asking this question.

Also, I'd be using headphones while taking the test so as to not be rude to the other takers.