oldishfart, if your age is correct then you might have had a stumbling block. I'm pretty sure mandatory retirement age for active atc's is 55. At 57 this doesn't leave you many working years to be trained for.
Domdaniel, I wouldn't get overconfident. Many highly intelligent people have passed the psychometric but have been knocked out in the interview. Best thing you can do is try your best and be as well prepared as possible.