Hi,
Sorry but you  have not mentioned the exam which you are talking about as well as other details like your category , state and your marks and rank  . So please provide proper details so that we can solve your doubts .
Talking about bsc agriculture here is the list of top colleges for bsc in agriculture -
TNAU , Coimbatore
ANGRAU , Guntur
Punjab agriculture university,  Ludhiana
GBPUAT , pantnagar
Mahatma phule krishi vidyapeeth , pune
Birsa agriculture university,  ranchi
Hope it helps..