Hi Souhrid,
I would like to let you know that although you are from West Bengal and also have passed your 10 and 12 from West Bengal, you would still require a domicile certificate from an appropriate authority in order to have a hard proof that you are a permanent resident of West Bengal.
Some appropriate authorities from whom you can get your proforma signed are:
Police Commissioner
Deputy Police Commissioner
Municipality Chairperson
Municipality Ward Councillor
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