LH
Think long and hard about jacking college now.
I binned Uni 2 years through after the RAF binned me and it was the biggest mistake I've made in my life.
It's much better to get your a levels and then you've got a chance of joining the forces or getting sponsorship, what's another year in your life when your 17
and there's nothing to stop you doing your A level and having a part time job so you can start your PPL, It'll just take a lot of work.
But the main thing has to be get A levels, not just as a fallback if the medical or something doesn't work out but wouldn't it be far nicer to have BA pay for your licence than have to spend the next X years struggling to get there through your own finances?
Sorry if this isn't what you want to hear, and I'm sure you've got great reasons for leaving college now, I know I did and look where it's got me.
Not big or clever