What are the windows for entering indian Airforce through NDA?

I will be 16 yrs on sept 2007. And would give my 12 th board on mar-April 2009. How many chances would be left for me to give the NDA test then? when will they release the forms etc. Whats the admission procedure and how much time it would take. What would happen in the Pilot aptitude battery test? how to prepare for it. Need help from anyone who has gone through these test or who knows someone like that? Help!

after completing the initial training on what basis would the cadets be divided into fighter ,transport and helicopter streams

thanks..