Quite a few people I know were trained by one company and then tested by another airline for the LST. The basic handling and operation of the aircraft in emergencies is virtually the same. The main difference was in SOPs but with enough effort its not impossible to get your head around them on your own. Don't expect to go out on the lash every evening during the TR, you need to get your head down and learn your stuff. I remember being 2 sessions into my TR and crapping myself because I only had another 5 sessions left before the LST but it should all come togerhter. Then again did any of these people who failed in AMS have a history of needing extra training for CPL / IR / even PPL...?