Hey Roshan ,
Selection procedure of Ncc C certificate entry is
1. Applying for C certificate entry in the Indian army site

2. Shortlisting and receiving call up letter for SSB

3. Appearing for Service selection board , its a two stage procedure with screen in as the first stage

4. After getting selected in SSB , then follows the medical and if the candidate is deemed to be fit then ,comes the wait for merit list

5. Followed by call up letter for academy

All the best