Can you tell me ... would you able to produce your ews certificate and if not ...what happened?

Hi Ajitabh

Congratulations on qualifying for the rrb po interview. If you cannot provide the ews certificate then look for other category proofs that they accept. If you cannot find any then it is better to contact their helpline or send an e-mail asking what to do. What they tell you to do would be the final decision even if they tell you that you would not be considered eligible as ews.