HI, Admission in universities or institutes offering BSc Ag is done basically in two modes. Either on the basis of the marks obtained in the qualifying examination (Direct Admission) or written exam conducted by the university/institution that offers the degree.

Managament quota is something which varies collegeto college and so you will have to really visit the institutes in which you are interested to take admission to know the managment quota process if there is any.

Let me know if you are asking for any specific institute.