@ Ankit, its not difficult at all. The general agriculture book (with question bank) as well as books with the question bank of your subject are available in side IARI book shop (situated opposite to International guest house). You collect that book and read it thoroughly. You will definitely be successful.
First of all you start reading any text book completely. Again you start the same text book. Like this manner, you have to read 6-7 times. Definitely, you can remember each and every point in the text book without learning