It’s answer NO
OBC/SC/ST category member not make ews(Economically Weaker Section) certificate .it is only for general category members.
EWS quota is only for General Category.
Economically Weaker Section(EWS) or Economically backward classes (EBS) in india is a subcategory belongs to general category .not for any backward category .
EWS scheme launched for general category .it is launc in 2019.for general economically weaker section.
For General Candidate now have a quota for exam and any others work .candidate can help using ews certificate in state,center exams. using ews certificate quota have a specific reservation system.
OBC/SC/ST:- For these category already have a reservation quota.in these category not need ews certificate in india
General candidate profit 10% reservation in any exam.
Eligibility for EWS quota:-
1.Family income is less than 8 lakh per annum.
2.Agriculutre less than 5 acres.
3.residental flat is less than 1000 sq ft.
4.residental plot less than 100/200 sq ft.