When I was there, a year ago, the pass rate was somewhere around 80% for the CPL and IR. On that basis you only have a 64% chance of passing both first time - and failing is really expensive.
Whilst certainly higher than the industry average, you are by no means guaranteed a first time pass CPL and IR pass, which indicates to me that they aren't 'overtraining'.
I do understand, that it can feel that way, when you are self funding and burning through the cash at a frightening rate. However I think, on balance, you probably have to accept they know what they are doing.
On a more positive note, I was asked at interview where I had trained, and they seemed pleased with my answer - which has to be worth something.