hi,

see robotics and computer science is two different field, robotics is a new emerging technology and most colleges offers m.tech courses on robotics, robotics is the combination of mechanics, electronics and have some programming concept, however if you have interest in computer science and mathematics you should take computer science engineering, however if you are a physics and maths lover you should take electronics and communication engineering which is really useful for in future you want to do mtech in robotics.