mareepasheep, ahaha, a noble pursuit indeed. As long as you have those around you willing to play Pokemon, wanting to start and run a league is a great thing to do.
The exam runs for...45 minutes, correct? That gives you, on average, 67.5 seconds per question. The rulings ones will probably not take much more than 20, but it's those last 20 where you actually have to think - and if you haven't been to that many tournaments, odds are you won't get that many correct. In fact, the first time I took the Professor Exam, those were the areas I didn't do so well on...but fortunately I got a 33, BARELY a passing grade.
How knowledgeable would you say you are about rulings, tourney procedures, and such?