How to become a CID or CBI officer after 12th

How can I become a CID or CBI officer after 12th??? Is there any course to pursue???

Criminal Investigation Department is a crime detection agency. This department conducts own exam, and you can appear for them after your graduation only. Basic eligibility for this post is as following:

CID and CBI officer eligibility:
The applicant should have completed graduation in science stream from any recognized university of India, and you have to crack the entrance examination conducted by the department………….

Candidates who want to join the CID must have certain basic skills like an ability to analyze materials at a glance; the candidates must also have excellent communication skills and a pleasing manner.

i want to become a cid officer after completion of 12th mpc