Before I took mine, I conditioned myself to sleep for exactly 18 mins during the 30 mins break. I also found it impossible to remain focused throughout the psyc section. I decided it was better to give myself an unofficial break and do well, than to struggle the entire time and feel even more anxious about my performance. If everything, if all fails, take a break during the actual test, splash some water on you face and listen to a mental recording of Shia LaBeouf screaming DO IT!! JUST DO IT!! DO IT!!