Thanks for the reply. Walking out there were four problems that I stared at the screen for 2 minutes and couldn't no anything.. and i could do them in my head on the way out in ten seconds. Clearly I was pretty nervous. No other things were different. Honestly, I tried all " stress techniques"/ breathing stuff and come on... if your nervous that really isin't helping. I am going to take a beta blocker next time and study again for another month and a half. Hopefully this will help.
About nerves and pressure - two days back, I took an exam (not GMAT), a paper test. It's a 3 hr test. There were a couple of questions which I found hard and just couldn't work out. I marked and left them for the end. At the end of the test, I had almost 45 mins leftover and was super relaxed. I went back to those questions and did them in under 30 secs each. What does this account tell you? It is all about the nerves! (as I think you figured out for yourself too) Once you relax your mind, you can solve the toughest questions easily. But if you are wound up, the easiest questions are going to seem really hard. If you know that the questions are actually straight forward, it should ease your mind a little. Every question in GMAT is do-able in under 2 mins and is based on simple logic. If you remember this, you can beat the software next time. Just refuse to get pressurized since you know your stuff.
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