If that’s genuinely the case then it shows the C&T staff are incompetent trainers straight up, if you can’t train 70% of long term FOs to command standard the problem is with trainer, not the student.
Would strongly agree with that. Either the company is employing dud pilots from the start or the training department is terrible. CASA should be taking note of 70% fail rates and asking questions on top of the maintenance issues in play. 70% failing means they have been operating on line with insufficient knowledge to take over should the left pilot drop dead, after all that's what part of their duty is. If you can't just slide over to the left after a few years on type then you need to look at yourself, if it's happening enmasse then the company training system is broken.