Hi Nithya!This is Neeraj Atluri.Don't be worried.The reasons may be different , but the common reason is if your prefferd seat in preffered college is occupied by others who got best score than you.You will have plenty of oppurtunities for getting a seat in other colleges.If you have any doubts regarding this reply me,I will help you.

Hello Dear,

THere is only 1 reason that you are not selected in the 1st round of counselling that is your rank, your rank doesn't meet the needs.

you wait for the 2nd round of counselling and have patience.

good luck