Hello,

There are many government exams which you can appear after graduation in civil engineering. 

If you want to appear for exams in Engineering feild you can go for GATE exam amd get into PSU or do M.Tech or go for ESE(Engineering Services Exam) to become an IES officer. It is the most prestigious job an engineer can get in India.

If you opt for courses other than engineering you can go for Civil Services, SSC, Bank exams etc.

Hope it helps