I am a hindi medium student. Can I use some words in english of subjects like economics and science? Is it true that we have to write such difficult words in 'Devnagri'?

hello sir/mam
I am hindi medium student can i use terms (economic, Science, technology) in English in mains exam? some people say you have to write in "Devnagri" Is it so??

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you have to be very careful. Accordin to UPSC , Candidates exercising the option to answer papers in any one of the languages included in the Eighth Schedule to the Constitution may, if they so desire, give English version within brackets of only the description of the technical terms, if any, in addition to the version in the language opted by them.
Candidates should, however, note that if they misuse the above rule, a deduction will be made on this account from the total marks otherwise accruing to them and in extreme cases, their script(s) will not be valued for being in an unauthorised medium.