Write your concerns with details to your fleet training manager not here.
And what exactly do you expect from such a letter?
After all it was those same managers who trained the FO, the captain and the trainer and gave them the nod!
I know nothing will change with a rant on here, but nothing changes anyway with such a rotten and sometimes even corrupt system in dire need of bodies. So at least we can vent some anger here, it's relieving .....