Can I Join CBI after 12th ?

I am a student of class 12th. Can I join CBI or CID after 12th? What is the procedure to join CBI or CID?

Central Bureau of Investigation is the top most investigation agency in the country. It investigates the top and big cases in the country.
For getting into that you need to write the exam conducted by Union Public Service Commission.

You cannot join CBI after 12th. Minimum qualification to join CBI is Graduation.

Eligibility:

=== Graduation from any recognized university
=== Age should be between 21 and 27 years
===5 years relaxation for SC/ST Candidates and 3 years for OBC candidates
=== The upper age is relax able for certain categories of employees working under government of India and Defense Services Personnel.
=== Minimum Male Height of 165 cms
=== Minimum Female Height of 150 cms
===Chest: Male- 76 cms
===Eye-Sight (with or without glasses)
Distant Vision :6/6 in one and 6/9 in other eye.
NearVision:0.6 in one eye and 0.8 in other eye

Exam Pattern:

The Examination consists of two parts:
Preliminary Examination
Main Examination

In the Preliminary Examination, there are two papers.
Paper 1 consists of General Awareness and General Intelligence.
Total Questions: 100
Total Marks: 100
Duration: 2 hours

Paper 2 consists of Arithmetic questions
Total Questions: 100
Total Marks: 100

In the Main Examination there are two stages. They are written examination and personality test. The syllabus for the written examination is:
General studies-100
English-100
Language-100
Arithmetic-200
Communication skills and writing-100

In the Personality test, they will test the personality and Mental ability of the candidates.