Top tip (had to get that in there somewhere)
Study something that you enjoy!
Don't think that the RAF want you to do anything technical at A level or uni. They don't neccesarily, so if you want to go to uni, do something that you will enjoy, you can be good at, and that will give you time to go and do lots of extra curricular stuff (like fly with a uas if they still exist then!)
Who knows, by the time you want to join, the RAF will suddenly realise they're really short of pilots, and start recruiting at something close to 'normal' levels.
Best of luck, and remember, the force will be with you. Always.