My story:
I had to take the test in another country (I live in Europe) because everything was closed in my country at the time I wanted to take the test.
The evening before the test just as I was about to plan my journey my internet connection stopped working. So I had to get the address of the test center from a friend.
I also realized that there were still 500 math questions and 2 practice test I would have liked to do but it was obviously too late. Not a nice feeling..
On the morning just before leaving home I decide to take a bigger bag and start moving my stuff from the smaller to the bigger bag, almost forgetting to move my money and passport that were hidden in a small sidebag in the smaller bag....
Then I take the train and arrive in the city where I will take the test. One of the most stupid decisions of my life, I decide to go there by public transport instead of by taxi.
Anyway, I arrive in the street of the test center 30 min early, quite proud of myself. Had I not taken the right subway and bus in a city I had never been to before with the help of a map received at the train station?
I'd noted the test center's address on my mobile phone.
What I didn't know then, was that I had accidentally erased part of the address because I had been nervously fondling with my phone. I had a feeling that there must be something wrong with the address. I had also noted the address on a piece of paper in my bag, but the stress made me forget that completely. So I was on this big street and actually looking for the wrong address with the clock ticking away.................
If it hadn't been for 2 great!! guys with internet connection on their phones (unlike mine) whom I asked for directions and who helped me realize my mistake I would have missed the exam.
But even with the right address buildings in the street were not clearly numbered and people I asked in the street could not help me out and most of them did not speak English. With the help of a kind man who actually walked a bit with me I found the right building literally right on time. Wanting to prove to myself that I can find my way around in a foreign city under time pressure almost made me miss my appointment. I didn't even have the phone number of the test center with me.
Looking back I think stress and fatige made me hyperventilate and act in an irrational way. I realize now how lucky I was on test day.
Prepare well and well ahead.
Avoid preparing things in the last minute as printers and computers really are unpredictable.
Don't underestimate the psychological burden of test day and take any kind of stupid chances!
Be it travelling to the test center or other.
Your head will be full of Gmat stuff and you will not be able to concentrate 100% on other important things!