JEE Main

You can get admission in Jamia Milia Islamia and DTU through JEE Mains score. But, for Jamia Milia Islamia ,you also have to fill application form of Jamia Milia Islamia.

You don't have chances. In 2017, round 1 cutoff was as follows:
For CSE: 202 Marks and ECE: 202 Marks.
Round 2 Cut Off:-
For CSE: 200 Marks and ECE: 195 Marks.
Round 3 CutOff:-
For CSE: 200 Marks and ECE: 194 Marks.
Similarly for EEE, so don't be disappointed. You have great chances of getting a seat in some other government colleges.
Best of luck.

Check the below institutes -
Jabalpur Engineering College (CSE)
Mahakal Institute of Engineering, Ujjain (CSE)
Ujjain Engineering College (CSE) - government. College
Techno India - Kolkata
Also check the below college predictor link based on JEE Main Rank/Percentile -
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

Admissions are based on jee main rank. For YMCA you need to give JEE Main exam. After that, you have to fill Haryana B.Tech counselling forms available at HSTES site.
If your rank is less than 60000, you get admission easily.

Yes, but with clearing criteria and in a merit scoring rank.

This depends upon your category, otherwise in general there is very less hope in government engineering colleges.

Yes, you can get admissions at IIT-Gwalior. You have scored a very good marks and when you belong to ST category then you will be getting good opportunities congratulations for the marks scored and all the best for admissions. Thank you so much. If you have got the information that you wanted please like my answer and feel free to ask any query.

You can check here https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

It is very less chance that you get any NIT at this rank, but you can try for state government colleges they may take you.