Yeah Gotta hope, respect to you young sir.
Basicaly, i do subjects which i am good at, chemistry, biology, psychology, mathematics and physics. However, if i were to get 5 streight A's - then nobody would take a glance at my O level results.
Wait untill you are into college untill you start to stress yourself out with all these 'looking for sponsorship' ideas, as in my opinion, these ideas will become a burden.
If you contact companies saying that you are still in school - they will probably just fob you off with some 'try applying in 2 or 3 years time' rubbish, just the way life is.