Engineer

Instrumentation is a niche branch with limited career opportunities. Role of instrumentation engineering can be filled by electronics, electrical and mechanical engineering also. ECE has wider scope and career opportunities. ECE grads are employed by all type of industries but majority in electronics, telecom, IT and ITES industries. ECE grads are preferred for IT infrastructure management and support roles also. ECE grads have opportunities in comparison to Instrumentation engineers.

Hello Abhi,
For getting into top notch product based companies like google, Microsoft,& cisco, you need to do to get into very good colleges like IITs, NITs, IIITs and BITs Pilani to increase your chances to get placed into these, otherwise its very tough for you to get into these companies you have to be your own.

For getting into construction field, you need to take civil engineering.

Please follow this link for complete details of rank and college:
https://www.shiksha.com/b-tech/resources/wbjee-college-predictor

SSC means staff selection commission is a well-paid government job under central government. Engineers serve particular departments of government.

Yes, your becoming engineer does not depend on your 12th score.

B.Tech mechatronics is the best branch to become robotics engineer. You can also opt for mechanical engineering.