maybe,
The apptitude tests are flying related, hand/eye co-ord, memorising radio/alt/speed/heading etc, spatial awareness. The maths questions are put into an aviation context, but are basically just your normal mental arithmetic questions. (you do get a pencil and paper, so dont worry!)
As regards the heels/flats issue, there is a part where you need to use your feet on rudder pedals. The CTC guys suggested to the girls present that they took off their shoes.
It's been said a million times before, but try and be chilled and relax. It's the best way to perform to your maximum potential!
Good luck!
M330