" Officer’s recruitment is advertised through Employment News and all important national and regional newspapers/dailies. Selection for Permanent Commission through NDA/NA cadet entry and CDSE (Graduate) entry is through a written examination conducted by UPSC, followed by an interview by the Service Selection Board (SSB). For all other Permanent Commission entries and Short Service Commission entries there is no written examination. Applicants are short-listed as per criteria laid down by the Naval Headquarters, (Directorate of Manpower Planning & Recruitment). Selection is through merit alone."

To know more go here:

https://www.joinindiannavy.gov.in/en/page/selection-procedure.html