I have 2 GCE O levels, a cycling proficiency certificate..... and not much else. As someone else mentioned, I too worked with many people with several degrees, etc., but ATC is a skill, particularly Radar Control. Some have it, others do not. Unfortunately many trainees do well up to the time they have to do it for real and then..... One student at LATCC did everything well, including the simulator, but come the day he had to start live training he simply could not walk into the ops room. Another student absolutely refused to employ 3-mile separation on final approach - claimed it was too dangerous.