After giving exams of 10+2, several exams of bsc and btech agriculture are there to sit. if you want to read under ICAR, then you have to sit on that particular exam. BHU has its own entrance exam. All government colleges have its own entrance exam. In case of private institutions, some admit students according to their merits through entrance exam and/or viva, some can admit according to the marks you obtain in 10+2 in PCB or PCA(for bsc) or PCM (for btech), and some colleges have direct admission facilities for students wit criteria that you have passes in 10+2 exam