Hi Mohit,
The Indian council of agricultural research examination is a very prestigious exam that lakhs of students answer every year. Since you are planning to answer it this year, I'll start off with the syllabus. Visit this link and you will get the detailed syllabus
https://www.icar.org.in/sites/default/files/Syllabus%20UG%20-2019_1.pdf#overlay-context=content/syllabus-aieea-ug-aieea-pg-and-aice-jrfsrfpgs-2019

Also if you have answered NEET this year answering ICAR exam will be really easy. Speaking of boons I would recommend you just go through the NCERT books in detail and answer the previous years NEET and BHU and other competitive exam question papers to prepare yourself. This exam is easy with prepration so these were my tips. Hope you do well and succeed.
Good luck