Several years ago I had my ticket to go to NavCanada but gave it up because after 3 years of schooling I was exhausted and the schedule that NavCanada has you on for training is brutal. As I recall a good 6 months and you don't get out much. Interview wise, it is difficult and most "fail", for me it was a mix of puzzle (thinking in 3D) and personality questions. If you want to be an ATC though you will have to go through NavCanada, they control that segment of the industry among some other things.
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