All three options are good but depend on what you want.
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Mechanical Engineering at NIT Nagpur is good if you like machines, engines, and designing things.
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ECE at NIT Raipur is good if you like electronics, communication, and circuits.
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CSE at IIITDM Kancheepuram is best if you like coding, software, and computers.
If you want a better future in tech and jobs, CSE at IIITDM is generally more in demand. But if you prefer core engineering fields, then Mechanical or ECE are good choices.
So, pick based on your interest and what career you want.
Hope it helps !