Agricultural Engineering

icar exam is a good choice.

yes its right but maintain above 75% in 12th

B.Sc Micro and Bio chemistry courses are common and there are many colleges that offer these courses. But agricultural engineering is a rare branch , only few institutions conduct this course. So its more demanding course than Bio chemistry and Microbiology
Agricultural engineers have opportunities in agricultural research centers, universities , large scale nurseries, plantations etc.

first off all concentrate on your 10 th examination because if you score lower then any good university. will not accepting you

I think no universities / boards provide those courses

Hello
You need to pass your intermediate (+2) with a very high score to get into agricultural university.
Cutoff is 92% for general merit for 2016 batch.
Upto my knowledge there are no private seats in agricultural university.If your family occupation is agriculture, there will special exam through which you can join even.