I was wondering the same thing and also need some advice. I had a horrible morning headache that persisted for over half of the first section, purely guessed on 10-15 questions. Realistically speaking, I'm expecting a 10+ points decrease than my PT average since that's the section I always go -0 on. I would cancel in a heart beat if this is my first exam, but I cancelled July, so I'm not sure what looks worse, 2 cancels or a cancel and a horrible score.