Hi Deepanjali,

After you've filled the prefernce form all you have to do is wait till the results for each subsequent iterations are out. There are usually 5-6 iterations that take place and if you like the branch you're being offered, you can opt to come out of the counseling session with the degree. If not, you can continue to slide up in further iterations. At the end of 4th or 5th iteration ( as mentioned by BITS ) you'll need to go the respective campus and register yourself and get the hostel room and stuff. This happens usually in late July. Till then, you can sit back and rest.

Best of luck!