Dear aspirant,

To correct a misspelled last name on a 10th SSC mark sheet, you'll need to contact the school that issued the document. They can guide you through the process of correcting the error, which may involve submitting an application, providing supporting documents, and potentially paying a fee. So your first step is to reach out to the principal or relevant authority at the school where you took your SSC examination. But remember that the time it takes to correct the name can vary, but it can take a few weeks or months.