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The questions are taken from a vast pool. One cannot say for certain that there will be 2 Q's from probability, 3 Q's from geometry etc. It depends on how you are doing in the test. Often tested on actual GMAT are much the same as you find in OG. To name a few - Number properties, Percentages, mean, geometry, probability etc.
OG is fairly representative of what I got in my actual GMAT. There is very less probability that you will see many questions of the same type.
Relax. Work on weak areas one by one as much as you can. That should help.
There isn't much time for you to study and prepare on new concepts at this point. If you don't feel ready and you can reschedule, you might want to delay your test date to give yourself time to study. But concepts aren't learned overnight. Study schedules vary, but if you need to learn a lot of new concepts in math, you probably want to give yourself a month or two to properly study the material and do practice problem sets, and spend time on this board as well. There are a lot of threads here with study plans.
If you absolutely must take it Monday, at this point the best thing you can do is get some sleep and prepare psychologically for the test. Make sure you're well-rested, calm and confident, and do the best you can. Remember, if the score isn't what you were hoping for, you can always retake.
Check out this awesome article about Anderson on Poets Quants, http://poetsandquants.com/2015/01/02/uclas-anderson-school-morphs-into-a-friendly-tech-hub/ . Anderson is a great place! Sorry for the lack of updates recently. I...