I have a good few years driving class 1 and I failed loads of assessments,because i was on pallets straight through yards hardly any reversing work,the good firms will have a decent trainer to put you right though, the ones that are not helping new guys are either top payers or poor firms that don’t help themselves out at all.
A fail can really knock your confidence and they know it does. If the industry was that short of drivers they should be training anyone who has the actual ability to drive.
I imagine you will crack it soon enough pal, don’t let them grind you down.