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.