Hello.

The subjects you have to go through for ICAR AIEAA is

Plant biotechnology

Plant Sciences

Physical science

Entomology and nematology

Agronomy

Social Sciences

Statistical Sciences

Horticulture

Forestry/agro frostry & silviculture

Agricultural engineering and technology

Water science and technology

& There are few more subjects to know the complete syllabus you can check the main website: https://www.icar.org.in/content/syllabus-aieea-ug-aieea-pg-and-aice-jrfsrfpgs-2019

A pdf is available on the website with the subjects and the syllabus within those subjects. I.e the units you have to study of those subjects.

Hope this will help.

Thanks.