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You can write many government competitive exam after 12th. Few of them are -
NDA
- SSC CHSL
- SSC MS
- SSC GD
- Railways Recruitment Board exams ( Various type)
- state government jobs. - various central ministries group C and D ( many times through SSC)
- Indian Army exams ( Navy SSR, Air force group X etc. )
- Central and State security forces exam
- Indian Cost Guard recruitment
Broadly the competitive exam after 12th can be categorized into central and state. Which can further be seen into contaxt of exam conducting authority UPSC SSC Railway. As there are lots of exam, I suggest you to target set of exam which has same pattern. It need 1 to year of continuous preparation to crack these exams. The earlier you plan, more easy it become. Best wishes.