Section 189(6) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(6)A candidate for Branch Rank who fails in the prescribed qualifying course may, on expiry of 2 years from the date of failure, be allowed a further opportunity to qualify it shall otherwise eligible, and may be given his original position on the course roster, provided he satisfies the following conditions :(a)recommended for a further trial by the Captain of the ship or establishment concerned, and(b)continuously recommended for Branch Rank under Regulation 181.(c)have passed the preliminary professional examination again.If accepted, he shall be required to take all the courses and examination, and on qualifying, may be considered for promotion alongwith other eligible sailors.