Hello
Top colleges for B.Sc Agriculture in India are

• Tamil Nadu Agricultural University
• Acharya NG Ranga Agricultural University
• Lovely Professional University, Jalandhar
• Punjab Agricultural University
• Chandigarh University
• Anbil Dharmalingam Agricultural College and Research Institute

B.Sc Agriculture is a 3 year undergraduate course. Average fees per year in government colleges is around 10,000-30,000 Rs and for private colleges it is 1,50,000 Rs per year.
The admissions are based on entrance exams conducted by respective universities or marks secured in class XII.

Good luck