Are there any possibility to become a DJ? Like a test show or something?

To be honest, I don't think the radio is alive anymore. The only host I've ever seen on now-a-days is Mar.

If you're still waiting and wanting to run a show, then I've some slots open on the Sheezy TV beta channel/stream. You'd have to make some adjustments and play music videos and make and set up a room to film in/broadcast from - not quite the same as a radio show, but just as fun. If you're interested, join the club and then send me a PM: http://clubs.sheezyart.com/Sheezy_TV