The Registry tests to make sure you competent. It's an adaptive testing.
https://www.nremt.org/nremt/about/CBT_AdaptiveTesting.asp
You answer one question wrong about bleeding control, and they will give you another bleeding control question. If you answer right they will go on to another subject.
Some say that if it cuts off at 70 you either completely bombed it or aced it. If it goes to 125 you were teetering the edge.
But really there is no rhyme or reason. Sometimes you are just chosen to go to 125 by the computer as a source of data collection.
Don't get caught up on numbers. And DO NOT TAKE YOUR TEST ON A FRIDAY. You will be killing yourself with worry all weekend.