Hi menken,
You ask a rather broad question. Since the GMAT is a Computer-Adaptive Test, your individual GMAT experience (the exact questions that you receive and the order in which you receive them) will likely be relatively unique. There are some general patterns to the approximate number of question types (and specific subjects within those types) that you'll likely receive on Test Day though.
For example, you'll likely receive about 22 PS questions and 15 DS questions in the Quant section, although that can vary. In the Verbal section, you'll likely see about 16 SCs, 14 RCs and 11 CRs, but that too can vary. The larger sub-categories tend show up with predictable frequencies, but your performance will impact the difficulty of those questions and the number of rarer 'types' that you see.
I assume that you're asking because you're trying to optimize your studies.
1) How long have you been studying for the GMAT?
2) What materials have you been using?
3) What is your goal score?
GMAT assassins aren't born, they're made,
Rich