i have applied in csir net 2019 as GEN-EWS. the last date of filling form was 15 october but my EWS certificate issued after 15 october. is it valid if i qualify the exam with ews category??
Yes. It is not important when the certificate was issued. As this is a new reservation, it is understood that it takes time. As long as the certificate is authentic and has validity, you are absolutely fine. EWS certificate that you need to produce during document verification or counselling or admission should be valid at the times of document verification, admission or counselling. So even if it has been issued after October 15th, it is still valid and you needn't worry about it.