Since there is not much time left to get a new EWS certificate, contacting the National Testing Agency (NTA) that conducts JEE is your best option.

• Briefly state the address mismatch (Bihar permanent address in JEE form vs. Delhi permanent address in EWS certificate).
  
  
• Mention that there is not enough time to get a new EWS certificate.
  
  
• Inquire if there is any alternative document or procedure to address the mismatch
  
  In some cases, NTA might allow you to submit a self-declaration document stating the reason for the mismatch and confirming the accuracy of the address in your JEE form.
  
  There is a possibility that this might be flagged during the counselling stage. But if you have a self-declaration document or can provide valid proof of residence in Delhi (like Aadhar card), it shouldn't be a major issue.

A minor address mismatch is unlikely to disqualify you from the EWS category. However, it's crucial to address it to avoid any complications during counselling.

I hope it helps!