Unfortunately, we're talking about the Massachusetts state exam, not the national registry. The Mass state you get the whole 110 questions, no matter what, and you get 2 hours to take it. When you leave the testing center, you either have your EMT license/card or your letter saying you failed and how to re-schedule a new test.
they ask us 110 questions, but only 100 count... go figure that math
Massachusetts is also a weird state in that the National doesn't transfer into Mass. If you have the National, but not Mass, you still have to take the Mass written to get your Mass license. If you never took a practical for your National/other State, you have to take both a state practical and a state written...
Or at least thats how it was last time I looked, they might have changed it...