JEE Main

You must use Common rank.

Yes u get seat in bvrit.

Yeah you can get ECE in DTU.

No you can't get IIIT Delhi as you're not a home state student.

IIIT Jabalpur CSE is great and you can also get great opportunities there just for the placement you have to work hard on your coding skills.

Your chances can be made for the following NITs.
1. SVNIT Surat (Chemical)
2. NIT Puducherry (Mechanical, EEE)
3. MANIT Bhopal (Civil)
4. NIT Jalandhar (ICE, Civil)
5. NIT Srinagar (IT)
6. NIT Arunachal, Nagaland and Manipur Pradesh (CSE). .

Please tryout the following colleges.
1. Chandigarh College of Engineering and Technology, Chandigarh
2. Dr. S. Bhavnagar University Institute of Chemical Engineering and Technology, Chandigarh
3. IIIT Delhi
4. UIET Chandigarh.

If he belongs to the general category, the chance of getting computer science might is very less.

Hello Aditya Gupta, if I may say so, your ranking is a bit low. Right? But don't loose heart. Many a times miracles happen during admission process. To help you I am attaching a link that will predict the branch and the college that you can get based on your performance in this exam. https://www.shiksha.com/engineering/jee-main-college-predictor
Best wishes to you.

On the basis of the rank list, the counselling procedure will get started. JEE Main 2021 Counselling will be scheduled after the releasing of JEE Advanced AIR and JEE rank list. The counseling procedure will be started on October 16, 2021. you can get admission in NIT Agartala in the civil engineering branch in NIT Durgapur chemical engineering branch and other such nits and branches I can give you clear detail if you provide me your home state.