How do you apply for auditions through the TV industies as an actor

In reference to in-house courses (acting), my experience is that these SHOULD be run to TRAIN their actors primarily. There are a number of reasons for this, but mainly, so that the agent is kept up to date with their skill-level, and at the fore-front of their mind for work. Just quietly though, they are run to keep the agents doors open, so they can continue to get the actor work! I know this sounds harsh, but all actors know how little paid work is out there. If an agent is getting a maximum of 20% cut of that- how little money do you think they make?