I think its DPPG for aided schools as the pension papers are being sent to DPPG for issuing P.P.O. and G.P.O. for the teaching and non teaching staffs.
Dear friend,
WBPTE-DCRB-Rules has already been uploaded by nemo. follow the link
West Bengal Primary Teachers & Employees DCRB Rules
I am attaching a pdf regarding DIRECTORATE OF PENSION, PROVIDENT FUND & GROUP INSURANCE.
This thing is available in the official website of wb finance dept. wbfin.gov.in –>Directorate (under menu) –>PENSION, PROVIDENT FUND & GROUP INSURANCE
Hope these will help you.