roundthebend,
As stated above, you've had some great advice (wish I'd found the Eurocontrol elearning during my selection!).
One thing I will add is that the level of technical detail in this thread wasn't needed in the intial selection. Obviously it's advantageous to know more than is needed, but don't get too caught up on one thing. Saying that, I've been told by a couple of people that learning the stats well, (as i did) will only help you during your interview as obvious depth of knowledge shows motivation etc. Also been told that it is very useful at the college to know A/C performance, range etc.
Good luck and feel free to PM me if you have any specific questions about the selection process
