Hi monicagoodlett,
Unfortunately, the GMAT does not let Test Takers know how many questions come with an individual RC or IR prompt. Thankfully, once you know the necessary content and Tactics, the number of questions associated with one prompt won't matter much - you'll tackle each question in the proper way (taking notes, using Tactics, completing the proper 'steps', etc.).
From your post, it sounds like you're just beginning your studies. Is that the case? If so, then it would be a good idea to take a FULL-LENGTH practice CAT Test; you can download 2 for free from
www.mba.com (and they come with some additional practice materials). If you want to do a little studying first, so that you can familiarize yourself with the basic content and question types, then that's okay - but you shouldn't wait too long to take that initial CAT.
Two weeks ago, GMAC made a formal announcement defining some changes that will be taking place to the format of the Official GMAT (beginning April 16, 2018). These changes primarily impact the overall length of the Exam (meaning the number of questions in the Quant and Verbal sections as well as the amount of time that you’ll have to complete each of those two sections). In theory, a shorter Exam could make it easier for a well-prepared Test Taker to score higher. Unfortunately, Official practice CATs in the new 'format' don't exist yet - but once they become available, you should plan to take one (so that we can get a sense of how you perform under these new conditions). That score will give us a good sense of your natural strengths and weaknesses and will help provide a basis for comparison as you continue to study. Once you have those scores, you should report back here and we can come up with a study plan.
I'd like to know a bit more about your timeline and goals:
1) What is your goal score?
2) When are you planning to take the GMAT?
3) When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich