Dear Aspirant

You  would have to issue your EWS Certificate after April 2022, if you want to use it for JEE Mains 2022 and avail the benefit of EWS Quota.

If you issue the certificate now, then you can't use it for JEE Mains 2022, as it is clearly mentioned by NTA that the certificate will only be valid after April month of the respective JEE Year.

So, get your certificate after April, as it will only take less than a month if you have all the required documents.

Hope this helps