Hello vijay,

To become a cbi officer you must pass the combined graduate level examination(CGL) conducted by staff selection commission in every year. It is 4 tier examination which includes two online objective type exams and one descriptive type using pen and paper.

After that there is document verification. The eligibility is as follows-

1- To become a sub inspector in cbi your age must be between 20-30 years.

2- Must have a bachelor degree from a recognised university.

The pay scale generally stays under 34k for a sub inspector and for an inspector it is under 45k.