Indeed - a ubiquitous issue, certainly not restricted to electricians.
Indeed, and the nature of the training is often far less than ideal, concentrating on 'how to pass an exam' rather than starting by teaching the underlying principles, which then enable people to do a lot of 'thinking for themselves' (and also makes it easier for them to understand and learn practical matters).
Talking of 'pass marks' raises an issue (I suppose almost a 'philosophical' one) which I often think about but rarely see discussed. I don't know if things have changed but back in my day the 'pass mark' for degree exams (and also O-Levels {now GCSEs) and A-Levels) were generally in the range 40%-60%, meaning that one could 'pass' having got around half of ones answers 'wrong' (and/or not knowing answers to about half the questions). However, if, by virtue of getting that degree, the person becomes, say, a school teacher, doctor, nurse or whatever, there is then suddenly an expectation that they will 'get right' 100% of everything they do and say.
In just a few safety-critical situations (e.g. driving tests, airline piloits etc.) a single serious error will result in failure, that's fairly rare and, in most walks of life there are a good few people practising trades and professions on the basis of having just 'scraped through' qualifying exams, maybe having got nearly half of their answers wrong!
Kind Regards, John