environmental clearance process ??
on what basis screening is done ??
what is green field & brown field project ??
what is CDM & how it is done( its process) ??
laws and legislation's in detail ( specially tribal law- 2002) ??
how mine reclamation & mine rehabilitation is being done ??

tell me abt urself ??
wht is ur father's occupation ??
why ur 12th marks is low ??
why we should take u ??
what u will do here as an environmental engg. ??
wht u can do else for the organization other than an env engg. ??

be confident, don't fear, in technical if u don't know then politely & clearly say no.In HR part just them that u r dying do join his organization & was waiting for this only simply u r born 2 join this organization only.

2 interviews- first was only HR & next comprises both Hr & Technical . only i was the guy which applied & got selected.
my self confidence, fluency, good project works, born 4 JSW approach and finally luck.