Firstly congratulations, you have got a pretty decent rank. Now coming to the point, in your situation I would say you should either go with BIT Mesra CSE or DTU ECE, see IIIT Gwalior is at par with BIT Mesra I would say, but as you are comparing 5 year IT vs regular CSE at BIT Mesra, I would suggest going for BIT

Now for BIT vs DTU it completely depends on your personal choice, weather you want a better branch or better college, DTU is certainly better than BIT and objectively speaking CSE is in general considered better than ECE. So it all boils down what you want to sacrifice... Although I would say you won't regret in both the cases as both are indeed very good colleges.

For exploring other options at your rank you can use the following college predictor

https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

~Sach Thadani