Dear aspirant,

in order to become a teacher in a government school your minimum educational qualification should be PRT, TGT, PGT, and also you will have to qualify the central teacher eligibility test or state teacher eligibility test which is also known as CTET/TET.

since you completed your graduation you need to do masters in the subject in which you wish to teach which means PGT is compulsory and try to get teacher training certificate and prepare for CTET OR TET Examination.