I applied through a college, There was an aptitude test in my college. The selected students had to attend further rounds in Banglore college. The second round was GD where they will ask you to choose any topics. I got selected in Gd after this there was technical face to face round where they will ask you to choose any subjects from which they will ask questions, the thing is they will test your confidence. Even though the ans is correct they will ask how is it possible. You need to be more confident.