Hii Swati!

Do not worry such things can happen and we need to take decisions wisely. I will recommend you not to take risk and apply for caste certificate again and fill in the details correctly. You can request the issuing authority to issue it early.

Secondly if it takes time and your examination website allows undertaking you can upload that and later at the offline verification stage you can show the caste certificate.

I will also suggest you to once confirm this with respective authority of exam/admission website. Most of the times they have mail/contact info queries so you can mail/contact them directly.

Therefore choose the solution according to situation and feel free to ask other relevant doubts.