dear shivam kashyap,

At this time you have to focus on your graduation and also start study NCERT and basics books of UPSC like M Lax. Polity , Spectrum History , Geography , Economics etc and one more thing you have to start reading News paper ,it is one of the most important part of upsc that you start right now and if you are not comfortable  then at least you have to watch news analysis on YouTube  regularly.   After Graduation you have to dedicately prepare only for UPSC and revise all those basics books of UPSC (not ncert) that you have all ready  studied and then start your UPSC Preparation completely .

Hello,

To give civil service exam you need to be a graduate from any stream.

So after 12 th you should join a graduation course.

After graduation course you can apply to civil services exam held by central government through UPSC or you can apply for state civil services exam.

The details of examination pattern, syllabus and other details you can check on career 360s website.