to become cid we need 2 years as police

Hy,

CID, can be joined by the following ways:

You join the police force, as a hawaldar or an assistant police depending on your qualification. After that you qualify the internal exams and apply to the CID department

You could clear the UPSC exam, after Graduation any stream and join the CID team as an Assistant sub inspector

You pursue Graduation in criminology clear UPSC and join the CID team

But please note apart from qualifications and entrance exam, the candidate needs to be physically fit. At the same time must be a problem solver and must be ready to live under any circumstances and must have the ability to take risk.

Hope this helps.

Wish you good luck...