Hii Vigneshwar!! ICAR is the entrance exam conducted by NTA for admission in agricultural Universities. ICAR contains 5 subjects, namely, physics chemistry biology agriculture science and mathematics. You need to attempt only 3 subjects out of these 5 whichever you are comfortable in  You need to study your 11th and 12th science books rhorouthorto clear the knots of the basics. After clearing the basics, all you need to do is practise a lot. There are 60 questions each.

• In physics, 90% of the questions are numerical so practise them a lot.
• In biology, NCERT is more than enough if read meticulously.
• Chemistry requires plethora of mugging up and strong grip in formulae

Practise from.mock papers and previous years'question bank.