Dear Nanda, there are total 12 subjects in ICAR pg exam. The subjects are Plant Biotechnology, Plant Sciences, Physical Sciences, Entomology and nematology, Agronomy, Social Sciences, Horticulture, Agriculture Engineering and Technology, Forestry, Silviculture and Agroforestry, Statistical Sciences, Water Science and Technology and Home science.

For more information, you can check out the link below

https://university.careers360.com/articles/icar-aieea

I hope this helps you!