It's possible that you can submit a self-declaration for your SC certificate during IPU counselling, but it depends on the specific guidelines set by the university.

If the website information is unclear, consider calling the IPU counselling helpline number (if available). Explain your situation and inquire about the possibility of submitting a self-declaration for the SC certificate.

https://www.careers360.com/exams/ipu-cet

I hope it helps!