Hey Dear, if you are a mechanical graduate than you should definitely choose being a business analyst as you will learn the proper organization of a business model or its integration with technology, which would make you understand the real sense of cash flow in a business. Whereas being a data analyst without coding knowledge would be a waste of time and you will be able to concentrate only on a particular data everyday and you won't learn something new.

hi,

see to become expert in data science related work you need to learn about python,. r programming, sql , ,ms excel,. now for core engineering students python is quite easy programming language to learn , however if you have no interest in coding, but have good ms office knowledge with advance excel works, good problem solving skill, communication skills you may work as a business analyst profile.