Hey Swarali:)

Thanks for reaching out!

yes, you cannot change your category in the AIAPGET application now,but you can update it at the State counselling stage. You should submit your verified OBC-SEBC caste certificate,cast validity and NCL(if required)at the time of document verification.While submitting clearly inform the authorities that you had applied under open earlier because your cast validity wasn't ready and now you've all the documents.The. Counselling authority will then consider your vaste as OBC-SEBC for seat allotment.If you fail to submit or report this during verification,you'll remain in the open category.

However, contact the Counseling helpdesk in advance to avoid any issues.

Keep all orginal documents ready,report about the earlier open category and check the counselling schedule carefully.

Hope you'll find this helpful!