Hello there

You can try these books out for your preparation

NTA-ICAR: AIEEA - PG Entrance Exam Guide. by Dr. B.B. Singh.

rs.274

A Competitive Book Of Agriculture For Upsc, Pscs Ars/Srf/Jrf, Pre Pg & Ph.D. Entrance. by Nem Raj Sunda.

rs140

General Agriculture For I.C.A.R. Examinations (J.R.F., Ph. D., S.R.F. & A.R.S.) by Muniraj Singh Rathore.

Hope this helps. All the best.