Since you're BC-B you cannot apply for an EWS certificate.

Hi

No, you do not require an EWS certificate, Economically Weaker Section (EWS) in India is a subcategory of people belonging to the General Category having an annual family income less than 8 lakhs and who absolutely do not belong to any category such as SC/ST/ OBC /MBC(Tamil Nadu). If a candidate who doesn't fall under castes recognised as SC/ST/ OBC by the Govt. Since, you are recognized as BC-B you cannot even get an EWS certificate.