Are you kidding! 9000 rank in JEE ADVANCED , and you are aiming for CS in IIT's. Forget it you aren't going to get it at least not in the good IIT's which are few years old. I am not talking about th recently opened IIT's which have no placement stats , no records.

Even you are under girls category , You are not going to get CS. You can aim for other branches but that also will be a bit hard . But still there is a chhance that you might get into good IIT's. 

Just study the statistics of previous year IIT's trends and then prepare a sheet of which college you want to go and which branch you will take.

All the best for your future