Yes, wrong I think. People's performance varies from day to day, and if doing the test just once, then some people will pass it because of good luck shape that

Yes, wrong I think. People's performance varies from day to day, and if doing the test just once, then some people will pass it because of good luck shape that day, although another day they would have failed. When constantly predictable high performance is important, it makes sense to do the test on a bunch of different occasions, and look at the overall result (like, lowest, median and average scores). And it'd be ok to do a bit worse on one occasion, as long as you were always above the minimum. Rather than in effect randomly picking just one test result. Looking at the results from many tests, reduces false negatives, but also false positives. (And of course if studying and practice matters, getting to re-take the test some years later: yes of course, but possibly the test should then be a little bit longer.)