You said that the EWS certificate, you have right now is valid from March,2021 to March 2022. Now if your EWS certificate was issued in March, 2021 then it was valid for the fiscal year 2020-21 i.e., the validity of the certificate was till March 31,2021. But if your certificate is issued after 1st April 2021, then its valid for the fiscal year 2021-2022. Now if you need the 2021-22 fiscal year certificate, then you apply now for the EWS and its expected that the certificate is going to be issued by March,2022 as a result, the EWS certificate will be the valid one for the Fiscal year 2021-22.

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I hope this answer helps. All the very best for your future endeavors!