Since you are interested in government job, I would suggest you to do graduation first and then prepare for entrance examination of government sector jobs.

You can prepare for SSC examination, Bank PO exam as well as if you want to go for higher posts, then you must prepare for UPSC and afterwards you will become an IAS, IPS, etc.

Railway jobs are also a best option if you want to do job in government sector. 

Choose according to your interest. Best of luck!! 

hello

prepare for SSC or UPSC exams to get govt. job .

1)complete your graduation and then prepare for the ssc exam

or

2)prepare for the exams simultaneously with your graduation to get a higher post

or

3)start preparing for the exams now