If you want to get a government job after 12th then you should prepare for SSC CHSL Exam.
Staff Selection Commission conducts the combined higher secondary level exam for those candidates who have a 12 class certificate from any recognized school or board.
After clearing the exam you will get Postal Assistant/ Sorting Assistant, Data Entry Operator, Lower Division Clerk, Court Clerk post in various departs.
It has three tiers.
Tier 1 – Computer-based written exam
Tier 2 – Descriptive paper
Tier 3 – Skill Test/ Typing Test
If you want to know the complete details like syllabus, exam pattern, tips, cut off then you should go to the above link.
Career Guidance After 12 – Get Government Job through SSC CHSL