Applying for any further courses requires the submission of your class 10th mark-sheet at the particular institution. So if you want to get back your lost mark-sheet simply download the lost mark-sheet form, fill it up and submit it at the CBSE Patparganj office in Delhi or at the regional office of your state. The charges for issuance of mark-sheet on non-urgent basis is Rs 100 and for urgent basis it's 200.

If you are from state board, submit the application at your state board office.

Hello dear student !

If you lost your 10th marksheet, you can temporarily get it from cbse digilocker. Also, you can write application to your 10th board for the same and they'll issue it within 3-4 days. You can consult your principal for further guidance. So you can apply for LLB and can use the temporary marksheet for a brief period of time otherwise can use permanent one if it is issued early.