Which is the best career for me in terms of scope that I can choose after completing class 12th from Tamil Nadu board?

It depends on your interest. But, nowadays, there is more opportunity and scope for management professionals. I will suggest you to introspect yourself and know your latent talents and give right direction. No matter what, the society says, make your passion your goal. All the best. keep shining.

It will depend on your choice of interest. You know better about yourself, which subject you understand well, that related course will provide you good career in future.