Ya- most people dont put stats into that group of questions. Stats you have to know well- especially because it involves averages and many other components, it really can include all types of math. Comb and probabiliy, however, are very few and I had two combination questions on my total of 3 tests and no probability. Spend a day really learning combinations - once I did that they all made sense to me and I never had an issue with any except for the really tricky ones- which I would skip anyway. Know the basics of probability but don't spend any time on advanced stuff.