IIT

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.

Yes,
You should go for counseling.
You will get admission in newly admission IITs for sure.
https://www.resonance.ac.in/reso/news/jee-advanced-branch-allotment.aspx
Check this branch and IIT college predictor.

Hello Akash,
IIT-JEE preparation is, to some extent, irrelevant of the classes you attend. It requires immense practice and clarity in all the concepts that are asked in the exam. All the classes that provide IIT-JEE coaching are good, at the end it depends on your efforts.Again, remember that it is not difficult to crack IIT JEE exam. All the best for preparation!

Yes, you will definitely get admission in an IIT.
You scored very good marks in JEE Advanced.
No need to worry about it.
https://www.resonance.ac.in/reso/news/jee-advanced-branch-allotment.aspx
Check this branch and IIT college predictor.

There is a link below that will help you find a college that you might get into with your score/rank:
https://www.resonance.ac.in/reso/news/jee-advanced-branch-allotment.aspx

This year JEE main cutoff for sc category was 32 while cutoff for advanced is
GENERAL CATEGORY-128
OBC -115
SC/ST-64.
You should have good marks to get admission in IITs.
I hope it helps.

Varanasi has many good coaching centers for entrance examination. I will suggest you to join JRS tutorials. You have be determined and focused to clear JEE with a good rank. All the best.

Chances are there but can't say surely. You may wait till spot round counselling. You can also try CSE related Branches like mathematics and computing IT etc.

Yes, you can. But, it depends on the other students of your category. I will suggest you to wait for the spot round or last round. You may get lower branches.

It is quite tough to get it as your JEE Advanced rank is too low but don't worry, just check the closing rank of different IITs by this link:
http://josaa.nic.in/Result2016/result/OpeningClosingRank.aspx