Hello Aspirant ,
The EWS certificate is valid till 31 March 2022 and not on 31 December as financial year in India starts in 1 April and End in March 31 so you will have to update your EWS certificate after 1 April 2022 you can do this by visiting the Tehsil or SDM office of your district.
Also different states have different validity for EWS so check your states validity also.
Hope this helps.
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