Hello aspirant,

If you want to appear for government exam after your completion of 12th in a science stream, you can try for various exams from the departments given below, the department conducts different exam under them for different posts,

=> Railways Recruitment Exams

=> SSC Exams

=> Defense Exams

=> Indian Airforce

=> Indian Navy, etc.

Besides this there were various exams in state level also.

For more information regarding the career after the completion of class 12th, you can visit the link given below,

https://school.careers360.com/articles/career-options-after-12th

Hope it helps you..

Best of luck..