Section 119(1) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(1)The following terms and conditions shall govern the selection and training of "Dufferin" cadets as special entry cadets of the Indian Navy :(a)Eligibility. - A candidate must be an unmarried male and must fulfil the conditions regarding the nationality as laid down by the Government.Explanation. - A widower or a person who has divorced his wife will not be treated as an unmarried male for the purpose of this regulation.(b)Age limits. - A candidate must be between [17 years and 20 years] [Substitued by S.R.O. 25E, dated 29th October, 1967] on the 1st day of the month in which the course at the National Defence Academy is due to commence. The age limits shall in no case be relaxed.(c)Educational Qualifications. - A candidate must have passed the Final Dufferin Passing Out Examination either :(i)with Extra First Class Certificate with at least 50 per cent, marks in Trigonometry; or(ii)with First Class Certificate with at least 50 per cent marks in each academic subject and in Trigonometry.