UPSC - Union Public Service Commission conducts IAS exams for recruiting people to the Civil Services of the Government of India.

Tips to choose IAS optional subjects --

-Choose a subject that you have an aptitude for and the one in which you have more than just a passing interest.
-Availability of Resources: Secondly, find out how easily is the study material, guidance, coaching, etc available in a particular optional subject.
-Availability of quality guidance makes learning of the subject easy.
-Subject Knowledge: Graduation/post-graduation subject should be taken if you are comfortable with it.
-Aspirant should be prepared to spend 100s of hours with the chosen subject.
-Don’t take a subject just because everyone else is taking it
-Science subjects should be handled by people with ONLY science background
-Art subjects can be handled by ALL
Optional Subject for Science Background to appear in Civil Services (Main) Exam--
-Analyse the syllabus in detail
-Analyse the last ten years question paper to figure out a subject’s difficulty level