Core branch may be difficult to get .

But u can get iit which are new .

Because of the quota of the girls u can also get good branch. 

Check the ranks and list in 6 th and 7 th round and fill ur choices smartly. 

Good luck

Hii Rashi

With your obtained rank above 15k under Unreserved category. It may be difficult for you to take admission in any of the IIT but as you are a Girl i think chances will be there for you because from these many years Govt is increasing more no of seats in many IIT'S inorder to balance the ratio of Boy and Girls. So try for the best .

good luck