Hello Arti,
At the time of filling your application for IBPS PO CLERK exam you are not asked to provide caste certificate.You have to enter primary details like your name, email id contact number etc and upload a scanned passport size photo and signature and a written declaration note.
But at the time of counselling you need to carry your caste certificate along with other required. SC/ST/OBC candidates must provide caste certificate issued by the competent authority in the prescribed format by Government of India.This is just enough.
I hope this is helpful to you.

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