Answer: It would be better if you can get study material from one of the tutorials like Brilliant's which also offers postal coaching. You may also refer to:
www.threeauthors.com/upsc-exams/model-indian-forest-services-ifs.asp
It is also important to note that mere academics is not focused but also your awareness about the happenings around you in the related field as well. You can also go through some journals related to environment and compile information for further use.
Hope that helps.
Counselor
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