Hello,
If you are very sure that you want to have a career in Robotics Engineering alone then it would be better that you complete your B.Tech in Robotics Engineering. But if you take B.Tech in Computer Science Engineering the advantage is that you can still take your masters in Robotics if you want to pursue a future in Robotics or you can try for another stream.
Below I will share with you a link where you can find colleges that offer a B.TEch degree in Robotics:
https://engineering.careers360.com/colleges/list-of-be-btech-in-automation-and-robotics-colleges-in-india
and the below link for CSE colleges:
https://engineering.careers360.com/colleges/list-of-be-btech-in-computer-science-engineering-colleges-in-india
Good Luck
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