Can graduates who done their major in environmental science eligible to apply for Assam Civil Services Examination or not? If yes can I take environmental science as main paper? Else, what other alternatives will be left for environmental graduates?

sir i am a graduate with major in environmental science,
can i apply for the assam civil services examination?
can i take environmental science as one of my main papers?
if not than what are the alternatives for me?
please help.....

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