As per the revised rules for the correction of names by CBSE, you need to visit your school and get it discussed in order to be eligible for the correction. Guardian’s name will be considered only within one year of the date of declaration of result provided the application of the candidate is forwarded by the Head of Institution with the following attested documents: i.True Copy of Admission form(s) filled in by the parents at the time of admission duly attested by the Head of the concerned institution ii.True Copy of the School Leaving Certificate of the previous school submitted by the parents of the candidate at the time of admission duly attested by the Head of the concerned institution. iii.True copy of the portion of the page of admission and withdrawal register of the school where the entry has been made in respect of the candidate, duly attested by the Head of the concerned institution.

The detailed procedure will be provided by the school.

For the forms and application details you may visit the link below:

https://www.cbse.gov.in/newsite/forms.html

I hope this answer helps. All the very best for your future endeavors!