Which will be better option MNNIT or MNIT Mechanical,or iiiT Gwalior IT ipg Mtech,or NIT Jamshedpur ECE? please reply

All choice are very good. You can go any of course in where you have more interested.

The colleges are top colleges in india . And also 90+% student get job from placement and they take very care of your future . And you also got practical knowledge from this college. There do  valuable projects which helps you in your future job and also job experience.

For NIT Jamshedpur - National Institute of Technology you can visit here

https://www.careers360.com/university/national-institute-of-technology-jamshedpur
You can visit seat, fees , cutoff,

For IIITM Gwalior - Atal Bihari Vajpayee Indian Institute of Information Technology and Management you can visit here

https://www.careers360.com/university/atal-bihari-vajpayee-indian-institute-of-information-technology-and-management-gwalior

You can visit official website also

ForMNIT Jaipur - Malaviya National Institute of Technology you can visit here to see more details
https://www.careers360.com/university/malaviya-national-institute-of-technology-jaipur

Thank you. I hope this answer helps you.