Engineering

It is impossible to get NIT and a very few chances to get a government college.

Yes, you can change your branch.

Kindly visit this link:
https://www.shiksha.com/b-tech/resources/jee-main-rank-predictor

Kindly visit this link:
https://www.shiksha.com/b-tech/resources/jee-main-rank-predictor

Check out this answer on Shiksha:
https://ask.shiksha.com/i-got-81-97percentile-in-jeemains2019-and-i-don-t-know-what-to-do-with-this-can-i-get-any-nit-gen-categy-qna-5215099?referenceEntityId=5215645

Definitely, you can. But you can appear for the 2nd round. I think you can get CSE in NITs because your 1st attempt is good. You can get your desired result with this attempt also.

First of all, there is a big difference between percentage and percentile. JEE score this year is in percentile and 61 percentile is not enough for CSE in NIT. Although, you can attempt the 2nd round, hope you achieve it.

As per me, computer science is the best option as the demand for AI and digital marketing is booming and will remain so for at least some years.