Electronics and Communication Engineering

Yes, you will definitely get ECE in IIT.
You got a very decent score
https://www.resonance.ac.in/reso/news/jee-advanced-branch-allotment.aspx
Check this branch and IIT college predictor.

Talking about placements in core ECE companies the scenario isn't really as good as expected since the cutoffs for this course are almost at par with IT of IIIT Allahabad. However, the students are permitted to sit for most IT companies coming to campus for placement and IIIT has a good placement track record overall. No branch specific statistics are available though.

Hello Nithesha,
Congrats on a good rank. You have good chances of getting ECE at SASTRA University. And, I hope your AIR is 612, so you will be called on the first day of counselling which will make you eligible to get a course that you wish.
Mention the stream in which your rank is 612
All the best.

Hello Vishwanath,
Your rank is far beyond to get any government colleges, however check here to know more:
https://www.shiksha.com/b-tech/resources/keam-college-predictor

Find a link below that will help you predict the colleges you can get into with your rank:
https://www.shiksha.com/b-tech/resources/ts-eamcet-college-predictor

In engineering first year, the syllabus for all the branch is common. But, when you enter into 2nd year, you have a different syllabus for different semester. You need to download VTU CAMPUS app to know about the syllabus and all the notes.

Hello Gundlapalli,
ECE means Electronics and Communication Engineering. To know more about the branch, click on the link given below:
https://en.wikipedia.org/wiki/ECE
Hope this Helps.
All the best.

Techno India Salt lake is best among the college mentioned by you but please check the link for better result to get more about all college and compare yourself
https://www.shiksha.com/resources/college-comparison