external judges do take these test, but i have never heard of more than one skater at a time(they generally want to see every detail of how you skate them) but no you dont fail if you make a mistake or two. There is usually an overall percentage that your aloud to make mistakes on, eg if u have for different things to do, you do two clean ones and then out of the 8 lobes on each of the others you make one mistake each of the 2 sections, you could still pass (if that makes any sense at all)- also you can have reskates if you do one element badly which they think you could do better. but also dont forget if you make a mistake on one move, but do another extremely well you can balance out to a pass as its an overall pass mark not being judged individually.
hope this helps x
