Section 6(5)(c) in The Assam District and Sessions Judges Establishment (Ministerial) Services Rules, 1987
(c)By selection on the basis of seniority-cum-merit from amongst Grade IV staff of the District and Sessions Judges Establishment concerned who have passed the High School Leaving Certificate or equivalent examination and have rendered at least 7 years of continuous service in the District and Sessions Judges Establishment on the 1st day of the year in which selection is made.