In which IIT can l get cse and ece??

Congratulations, you have performed pretty well in your JEE advanced exam.

by looking at the subjectivity and techicality involved in the paper, you are sure to get a decent old IIT.

Now since you have asked for the most demanding branch among the aspirants, so considering your category and marks

You should be under 700 OBC ranking to get atleast EC from the preferred old IIT.

For ranking regards, I would say to use rank preedicter of Career360 to have a better look.

https://engineering.careers360.com/jee-advanced-rank-predictor

Also, I would recommend you to wait for the official results to announce. Uptil this time, you should now completely relax yourself. Give yourself a vacation treat, you deserve that!