Hello aspirant

hope you are doing well and safe. With reference to your query,  I would glad inform you that passing certificates are issued by the cbse only. Their are major differences of dates of issuing passing certificates of students of cbse board ,so just stay calm and keep updated with the schools so that you receive on time and mail the authortiies to give some more time and file the undertaking

Hope you found this answer informative. Best wishes for your future