What are best career option after 12 ?

Assuming you are from PCM stream so you can consider below courses -

Engineering

Bachelor of Architecture (B. Arch)

Merchant Navy

Bachelor of Science

National Defense Services-Indian Navy Officer, Indian Air Force

Railway Apprentice Exam

Arts and Humanities

Business Administration and Management Studies

Commerce etc.

Note : But as per my view, I would suggest you to go for B.Tech/B.E as this would be the best suited course for you accordingly to your qualification. Rest your choice so decide well and consider the course in which you have maximum interest and in which you can give your best.

Good Luck!!!!