rid82
Staying calm is, in my opinion, one of the most important things in the GMAT actual test. If you fall short of time, you risk to switch to "panic mode", which in most of the cases means that your brain will struggle to understand even the most basic questions.
Know yourself and know how much time do you need to stay calm during the whole exam.
For example, If you know that you usually need some extra time in Quant section, guess 1 or 2 questions around questions 10-20 (the first) and/or 20-30 (the second). You can perfectly assure a Q50 doing so.
If you guess a question, the probability that it will hurt your score is "only" 60%, considering that there are 3/4 chances the question is not experimental, and 4/5 you pick a wrong answer (3/4 * 4/5 = 6/10 = 60%). In addition, if you spend some seconds to make an
educated guess, then that probability will decrease.
During the practice CATs, I can actually feel my anxiety level rise after I get consecutive difficult qtns. For my GMATprep 2, I got 8 DS qtns in a row that all required "higher" level thinking. After the 4th one which I wasn't confident about and seeing the 5th DS qtn, I noticed myself mentally screaming and moaning at the unfairness of it all. So I gave myself a medium-hard slap, let the tingling flow over me, told myself this is just a goddamn test that I can retake anytime, and got a Q49 for the section.
I wonder if the invigilators will think I'm crazy if I slap myself during the GMAT.

When I took the Series 7 exam back in NY, I remember seeing a middle age guy cry in the Pearson test room... This is a crazy world.