To do B Tech in computer science and Engineering First You need to decide that from which college You would like to do this course once You finalise Your college You can see Upon the entrance exam for that college, Many govt colleges give admission to the students based on the entrance exam Organised. Admission to India Premier College IITs is based on JEE Advanced which is to be held in the Month of May, For this, You need to first qualify JEE Main and also You need minimum 75% marks in Your class12th To get into IIT.