Section 5(1)(b) in The Indian Forest Service (Probationers' Final Examination) Regulations, 2016
(b)National language:-(i)The test shall comprise of translation, free composition, set composition, conversation and dictation.(ii)The probationer's knowledge of grammar shall be tested mainly by composition, conversation and passage for comment.(iii)Qualifying the national language is compulsory even if a probationer has studied Hindi as regional language.