Hi Aspirant,
Hope you are doing great as per the question asked by you, as you want to make E.W.S certificate in back date that is of year 2021 - 2020 which is not possible at all as it is government document which can be produced in current dates and in current year only. So you are advised to claim E.W.S category quota in 2022 - 2023 session only.
Hope you found this answer useful. Stay motivated stay positive.
All the best!
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