First, congratulations for taking this step.
I took my Masters for the first time on April 3 of this year. I did pass it. Yes I was nervous. But I will tell you that with the right preperation you will be fine. I studied on my own for a month before going up for it. I had to re-learn formulas, calculations, business law, everything it seemed.
My thought process was to go through the exam and answer what I knew then go back and answer the rest. Suprisingly when I was done with the first part I still had 90 minutes left and I used every one of them to go back to the beginning and double check every answer I submitted. 90% of the questions come right from the material you are allowed to bring in so use it.
Also keep in mind that you have about 3 minutes per question, if you find yourself using more then three minutes move on and go back to it at the end.
I could go on for an hour here but hopefully you have heard all this by now.
One last thing.
Have everything you can take to the exam ready Friday night, set your COMFORTABLE clothes out and just go to bed early Friday.
Best of luck.