See it depends on the examination you are talking about. In most of the cases its mentioned that the certificate must be issued after a following date. So you should read the information brochure very minutely in order to get the absolute information and the specifics as available in the information brochure. For most examination if you are filing the form at this moment then you will need most probably the certificate issued after March,2021 i.e., for the fiscal year 2021-22.

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