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To have an idea about the quality of the study material of the forthcoming postal course , to be conducted by DEBASIS GHOSH, please go thru the study material attached herewith. Exclusively compiled for WBCS Prelims and Mains Class notes – compiled by D GHOSH - on Biology , attached attached herewith . You are going thru a study material , compiled by DEBASIS GHOSH. To get quality study material of this kind on each and every subject –WBCS Preliminary and Main Examination – Join Postal Course , conducted by DEBASIS GHOSH