Hi nadiuska,
I'm not sure of their present rules, but in the past if you failed a written exam you had one chance to pass a re-sit. If you failed that re-sit then it was game-over.
In the practical exercises if you failed an evaluation you could be placed on a "conditional" continuation into the next phase of training if you show potential, with the same proviso, you would have to show improvement and pass the next exam, or it was time to leave.
Hope it helps.
RN