Hi there,

CBI is a national agency which is focused in handling criminal cases. It is governemd by Indian government.

In order to become a CBI officer one must follow these steps:

• A student must have passed their class 12th from any stream from a recognized board of India.
• A candidate must have pursued undergraduate course from any discipline with a minimum of 50% marks into it.
• For becoming a CBI officer,  a candidate should have appeared in SSC-CGL examination and can also in UPSC examination which is held on national level.
• Selected candidates will be asked for interview which is required to be cleared.

Several elgibity criteria are also their regarding physique of an individual.

Check out this link for better reach: http://cbi.gov.in/

I hope this information  will help you.

Thanks!!!