Section 735(c) in Police Regulations, Bengal , 1943
(c)The seniority of Deputy Superintendents shall be regulated by the order of their appointment to the service. Any such officer whose confirmation is delayed owing to failure to pass the prescribed departmental examinations or for other reasons may be superseded by his juniors who have not so failed, or may lose a definite number of places on the gradation, list as the Provincial Government may, on the recommendation of the Inspector-General, decide.