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In order to become a judge, one has to qualify the Judicial Service Examination conducted by the Public Service Commission of the respective state. To be eligible for the examination, one must hold a degree in law field from a recognized university or institution affiliated to any university recognized by the state government or the Central Government. Candidate must be enrolled as an advocate with Bar Council of any state or Union Territory in India on the date of advertisement for the examination. The age limit, however, may vary from state to state. For instance, the minimum age limit to appear for the West Bengal Judicial Service Examination is 23 years and maximum age limit is 35 years on the date of advertisement for the examination. The upper age limit is relaxable by 5 years for SC and ST candidates of West Bengal, by 3 years for BC candidates of West Bengal and upto 45 years of age for persons with disabilities having physical disability of 40% and above and by 2 years for candidates who have been in a government service for at least two years.
The Examination comprises of three stages:
Preliminary examination
Final examination
Personality test
Source: http://entrance-exam.net/forum/general-discussion/how-become-judge-after-pursuing-llb-what-age-limit-become-judge-834120.html#ixzz4j3hw2ALI