Let’s assume you mean the CTC scheme as that is the main sponsorship going at the moment. From accounts of people on the scheme a degree is not something that is necessary. Your personal skills and things outside school you have done are I would almost say more valid. Of course good grades in subjects helps however try and get your self involved in extra curricular things, the ATC for example. I have always been under the impression that you must prove to them with your achievements outside of school that you are the right person. Everyone will have academic qualifications, it’s up to you to make your self look better by other things you do.