Hi Hannah,
I am in a similar position to you but I am in year 12 so just started my A Levels. I am taking maths, physics, geog and spanish. I spoke with a BA pilot who said physics is useful for the ground school however the level of maths you need like many people have already said is very basic but nevertheless the a level is a nice qualification to have under your belt. (next time you are on a flight ask to go into the flightdeck, I have never been refused and the pilots have always been happy to answer my questions) As for the geog and spanish I took these because I enjoyed them the most.
Yeh careers people don't know what they are on about, I found it hard to keep a straight face when one said there are plently of jobs around!!!
I think the hardest part for us now is getting into the industry. I'm sure you are aware about all these stupid parc and flexicrew contracts for the big airline in orange. We can only hope the industry picks up a bit, but even if it does I still think they are here to stay, as long as they get enough morons our age (in a few years time) willing to fork out 30k for 6 months flying the bus....... We can have a shot at the Cathay and Etihad schemes but the competition is so fierce. One thing I can say for certain is I will not touch P2F and why anyone would is beyond me... they are destroying their own future as they support it, the airlines will keep on doing it, replacing them with cheaper cadets and then they will ahve no where to go. No job and 30k down the drain (+ however much the integrated course was which could well have been funded by a house remorgage) It seems like a vicous circle to me
I am thinking about cabin crew first as you would be able to make some good contacts, as aviation is all about who you know.
Good luck and hope to see you in the skies a few years down the line
Cheers,
Steve