If your class Xth board examination certificate is missing, then getting it back or getting a new duplicate one can be a hard task. You'll have to follow the below steps to get a duplicate one made:

• Lodge an FIR at your nearest police station
• Carefully fill the application form on the Board's website
• Prepare a demand draft of the required amount
• File an affidavit for the lost marksheet
• Send all the supporting documents to the Board

If you do these steps carefully, you'll definitely get your new marksheet made. All the best!