St Helier,
Best advice I can give to you at the moment is to concentrate on your GCSE's and A-Levels. If you don't get good enough grades in these then you can forget about applying to CTC! After your A-Levels, Id seriously consider going to University aswell.
You have got loads of time on your side, so maybe during the school holidays you might want to try and get some experience of working in an airport or something aviation based.
Enthusiasm is of course a good thing, but don't get too far ahead of yourself... 1 step at a time!
M330