Maybe take a little snooze at lunch?  If you skip the tutorial, you get an extra 15 minutes of break time to your total.  Scarf down your lunch and shut your eyes for a few minutes.  I wouldn't do it in the exam room, I'd be too afraid to lose track of time.  I'm not sure if you can have your phone with you at lunch (I'd assume you can, since I know people study during lunch) but you can set an alarm for 10-15 min.