Category A refers to the number of seats available per department officially and has been put up on the site. The fees in this Category is 2,60,000 Rs for departments except Aeronautical and Nanotechnology for whih the fees is 3,60,000 Rs per annum.
Category B refers to the seats that are made available once the Category A seats are sold out. And these seats are sold at 400,000Rs per annum.