Sixth Form Scholarship


I'm currently a 15 years old and 4 months female, who is looking to join the army as an officer after university. I am predicted very good GCSE grades (haven't got the results of this year's yet) and am relatively fit, but I am using the Army Fit app and am getting a lot fitter. I'm pretty sure that I may apply for the army sixth form scholarship next year, and I have a few questions regarding this, and would appreciate any help

1) when is the soonest I can apply?
2) what is the process? How long is it?
3) is the scholarship board the same as the officer main board?
Any extra information as well as this will also be appreciated, as there isn't a lot on the website. :)