NIT

Hello,
I hope you are doing well. Yes, you have chances for NIT in MNIT, Jaipur for B.Tech with your rank. Please check the cutoff for MNIT under OBC category for different branches
- Chemical Engineering - 4220 - 6997
Civil Engineering - 2735 - 4514
CSE - 558 to 1827
Electrical engineering - 1536 to 2855
Electrical and communication - 2163 to 3960.

It is not an NIT and IIIT, though. It can be said a GFTI as it was opened prior to Independence by government funds and a few organizations of Bengal.
Moreover, this institute is considered as an institute of national importance and it is mentor institute of IIIT-Kolkata.

Hello, Your rank is quite good. Roughly one fourth of 12K vacancies are reserved for OBC-NCL. So, up to rank of 3K admission is assured. But do not worry. I am attaching a link that will predict college for you. https://www.shiksha.com/b-tech/resources/jee-advanced-rank-predictor.

You can apply for private or autonomous campuses all over India. For those colleges, NATA is not needed.

Yes, you can expect a seat in any of the NITs. Warangal and Raipur are having more chances.

Hello,
I hope you are doing well. Not sure but You can check the list of colleges including NITs and IIITs that you can get according to your marks and rank. Use Shiksha JEE college predictor:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=7489993.

If you have a deep interest in aerospace, then only go for it because in this, you have to read higher level maths, physics, computers and many other things. It is also quite boring. Also, for placements, you need to do very well in your academics. You will get a government job in this. This is also a specialised branch. Taking core branches is quite good and also placement-wise. It is also quite easy with respect to aerospace engineering. Follow your interest and dream. That's more important.

Use the following predictor:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Yes, you are under 1000. You'll get CSE in any of the NITs as most of these rankers go for IIT's CSE and ECE and you have category too with it. I would though suggest you to push for NIT - Trichy, NIT- Allahabad, NIT -Surathkal, IIIT - Allahabad and IIIT-H for CSE, NSIT and DTU. These are the best colleges for CSE in India which you can get through JEE Mains.

Yes, huge difference is there. IIT is the best then NIT, BHU and then Central University and Amity.