Agriculture

That depends if there is a tie-up with your college and the institute where you would like a transfer. Also, you should check with your institute if lateral entry is allowed with your institute and the target institute.

Please refer to the link provided below for details on getting admission in Chandigarh University in B.Sc. agriculture:
https://www.shiksha.com/science/course/b-sc-hons-in-agriculture-chandigarh-university-245052

Since, you have been invited for counselling, it means that there are colleges where you can pursue your undergraduate course.

Please refer to the link provided below for a detailed list of colleges which offer B.Sc. courses in agriculture in India (Please select the region where you are interested for admission):
https://www.shiksha.com/science/colleges/b-sc-agriculture-colleges-india

ICAR is the governing body for all agriculture courses in India, so it is not advisable to study an agricultural course without ICAR approval, however the choice is yours. Please note that the degree or diploma in agriculture may not be recognized by several educational institutes or industries.

It depends upon every different colleges, but if you want to try in best college, then you have to give your 100 percent and at least try to get above 90 percentile in entrance.

Biotechnology is a better field.

Complete your course in B.Sc agriculture, and then consider getting admission in an M.Sc course in India or abroad. Getting admission in an M.Sc course depends on your performance in your undergraduate field of study, so do well in B.Sc and then consider opting for an M.Sc course.