government lawyer

Actually u need to be a graduate in law either in 3 years course or 5 years course with valid certification and u need to attempt Bar council of India exam and u need get registered in any of the high courts in the country and u will eligible to do practise , and thus u will become a lawyer

After enrolment as an advocate you may apply to Chief Prosecution Officer of district/ state as and when vacancies are published 

Are you a graduate in law and/or enrolled as an advocate?

P. venu sir , now I'm final sem BA degree student, my wish is to become govt advocate

Excel academically and get registration in BCI and who knows you may not be willing to join as Govt Pleader to work under a politician, whereas you can be independent and can common more respect and earn huge money as an individual advocate.  If you are not confident of your skills then cultivate friendship with such leading politicians locally from now onwards and their influencing may secure a job after you are qualified for the job.

After enrollment as an advocate in bar councils of your state, various notifications will be published on notice board in the courts, you can apply as per the requirements for govt. lawyer.Be sure Age restrictions will be there.