Section 12(2) in The Assam Economic and Statistical (Junior) Service Rules, 1980
(2)For promotion from one cadre of the service to another as mentioned hereinafter a member shall be eligible, if he has-(a)rendered service for a continuous period of 5 (five) years in his respective existing cadre, and(b)successfully undergone such training and has passed such departmental examination as may be prescribed by the Government for this purpose.
