Hii!
You haven't specified the question which you want to ask regarding Sainik school, Nagrota, Jammu, but let me tell you that it is government school, only for boys and is a boarding school. It is affiliated to CBSE and classes are from 6th to 12th. It was opened in 2003. For more information, refer the link below -

https://school.careers360.com/schools/sainik-school-nagrota-jammu

Hope this helps.
Good luck!