IIT

In my opinion, IIT is better than IIIT-Hyderabad for CSE because IIT provides better placements.

Yes, he can get admission in IIT-Kharagpur.
Kindly visit this link:
https://www.shiksha.com/engineering/course/m-tech-in-aquaculture-engineering-indian-institute-of-technology-kharagpur-293511

Yes, it is necessary to get qualify marks for getting seat NITs, IIITs amd GFTIs. Even though they are the marks decided to write JEE Advanced you must get more than qualifying marks to get seat in any NIT. Category rank was not helpful in this criteria.
All the best.

Hello Sourav,
The link below gives you the details about the Indian Institutes of Technology (IITs) in India:
https://www.google.com/amp/s/www.shiksha.com/b-tech/articles/amp/iits-in-india-blogId-12884

It's not possible for you to get admission in IITs or NITs.

No, to get admission in B.Arch in IIT, you have to score a good rank in AAT exam. Mains' result is only for NIT, IIIT & GFTI.

I prefer the courses offered at simplilearn.com. The learning approach is made really interesting. They have a mix of self-paced, interactive and applied learning that provides a better experience and helps obtain better results. The trainer tailored material enables to meet the needs of students with varying skills and abilities.

Hi,
Visit this link to check B.Arch colleges based upon your rank:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Please go with this link. This is a college predictor. I hope this will help you-
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Thank you