Hi everyone,
I'm a ATCO student at skyguide at the moment and I can confirm what jegoffinet, don't be too much scared about those test, they are made for people who doesn't have any previous experience, be relaxed and they can help you a lot if you ask them questions, don't be shy!!
I can confirm also that the training is perfect and everyone is very gentle, but of course a lot of commitment is need from your side.
I wish to all of you good luck and see you in Skyguide.