Just shows how the poor the current test is that the candidate has to memorize how many turns of the steering wheel to use.
Imo it should be a non-blindside bay reverse. To something like this
Maybe block their forward distance enough to force them to have to push the trailer into position with the cab at an angle first. Give them as many shunts as they want within reason as long as they get it on without damaging anything. Also examiner chooses where to put the ‘bay’ and truck so it discourages memorizing wheel turns.
Similar to this best pic I could find.
I know this is off topic but the most effective answers to your answers are given in person through tuition.
Seriously if they had a bay reverse in the test instead of this joke of memorizing steering wheel turns then I doubt I would see nearly as many numpties failing to get on bays and it would be a reverse that actually helps you after you pass your test.