Which subject should I choose as an optional? I am confused. Tagged: optional subject for ias mains exams This topic has 1 reply, 2 voices, and was last updated 4 years, 9 months ago by nisha roy. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts November 27, 2019 at 8:44 pm #2123 shamaaroraParticipant Optional subject December 18, 2019 at 7:15 pm #2165 nisha royParticipant Any subject in which you have an interest and can study for long hours without getting bored. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In