The best books to study for ICAR PG Examination are as follows:-
- General Agriculture for ICAR Examinations - Jain Brothres
- Objective Agriculuture Science - U.D. Charam and J.V. Patil
- Indira's Objective Agricultural Extension
Refer here for more info about the exam - https://www.careers360.com/exams/icar-aieea
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I hope this information helps you.