How to choose subjects for UPSC & MPPSC being a Mechanical Engineer? What is the format of these exams?

I'm student of Mech Engg . I want to appear in UPSC & MPPSC , how can choose subject and what is formate of these exams ? Please sujjest me... KRISHNAKANT

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sir, my first option is poticilal science and IR (because my service preference is IFS first, so it will be integrated preparation of mains and interview.)the second option by intrest would be psychology, but the intrest is not intense enough that i shall not consider my third option chemistry..i wanted a science subject, because of it's scoring nature. i shall not take physics coz i do not want to be competing with IIT/NIT graduates. (not because they are wiser, but they have the routine and can slog for hours!). Botany/ zoo is not too scoring, plus i have no background. i decided chemistry coz i am a chemical engineer too but consistently chemistry has not been doing to well, i have seen a few in the top like abhijeet a few years ago but that was his third attempt this year the highest rank of someone with chemistry is 147 sir how does scaling affect this subject, since hardly few give mains with this subject what is the highest marks that one has/ can get in chemistry after being scaled??please help if chemistry is wise decision. i know i must be the best in any option i take but if i can put a lesser effort and get some other subject, i will save timeawaiting your reply