Section 191(2) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(2)Before a candidate is selected to take the professional course and examination, he must :(a)be qualified under Regulation 181;(b)be a Leading Writer, qualified professionally for Petty Officer Writer;(c)have completed 7 years of service;(d)have passed the educational test for Branch Rank.