I'm 16 and Cpl in the corps.
I would suggest that you undergo a gliding scholarship. From there you can be recommended to complete a flying scholarship. This is 12-15 hours towards your NPPL however if you've started a PPL the hours can go towards that instead. I was under the impression you had to be at least 16 to do both though as both courses result in you flying solo. Unless you're on another course in the summer that I don't know about I would suggest this is the way to go. Until you are 16 I'd suggest trying to get as much AEF time as you can to show that you are keen and to help build up your experience before your scholarships.