There might be an issue during document verification (DV) for IBPS RRB PO if you mistakenly applied under the OBC category while belonging to the General category.

IBPS RRB PO selection considers category-wise cut-offs. Scoring high marks might not be enough if you're competing against the OBC cut-off, which is typically lower than the General category cut-off.

Since the application window might still be open (it depends on the specific IBPS RRB PO recruitment year you applied for), reach out to IBPS customer support as soon as possible. Explain your situation (applying under OBC by mistake) and inquire about the possibility of correcting your category.

If contacting IBPS and getting the category rectified seems difficult, you can still appear for the prelims exam. However, there's a high chance you will face problems during document verification if you haven't rectified the category by then.

Proactively contacting IBPS to rectify the category is the safest course of action. Explain your situation clearly and see if they can help. Appearing for the exam under the wrong category is risky and might waste your time and effort.

https://www.careers360.com/ibps-rrb-po-full-form

I hope it helps!