Dear Aspirant,

There is no guideline that you can use your EWS certificate dated on 16th march 2021. UPSC has asked for EWS cerificate based on financial year 2019-2020 but it should dated on or before 1st August 2019. In that prospect you can't use your EWS certificate if you have previous year certificate kindly upload that.

For more information on UPSC check this link:-

1. https://competition.careers360.com/exams/upsc-civil-services-exam

2. https://competition.careers360.com/articles/upsc-ias

Hope this helps.

Good Luck!