Hi Hansika,
If your 12th status is appearing as "Appearing and still open in your IPU B. Tech counselling application and during correction window closed, don't worry. It basically do not impact your counselling process immediately, but you have to submit correct documents (mark sheet and passing certificate) during document verification. Otherwise, later on, your admission may be cancelled. You should try to get in touch with the IPU helpdesk mention your situation to them or call the admission office as soon as possible to get official advice.
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