Section 120(2)(b) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(b)Candidates who are considered prima facie suitable shall be required to appear before a Services Selection Board for interview and other tests. The Government reserve the right to make a preliminary selection on the basis of candidates' educational and other qualifications and any other relevant factors, and then call up only those who seem likely to be the best candidates.