How do you write a Letter to examination controller for correct my name in certificate.?

Using a standard business letter format, the body of the letter should follow a logical sequence:

The first paragraph tells why you are writing:

I am returning the XYZ (name the specific certificate) issued by your office (department, agency, etc.) because my name has been misspelled.

The second paragraph provides the information needed to support your request:

The name printed on my certificate is Marcus Q. Publik. The correct spelling of my name is Marcus Q. Public.

The third paragraph tells the recipient what you want them to do; provide your contact information; always thank the recipient:

Please reissue the certificate with my correct name. You may send the corrected certificate to me at the address at the top of this page. If you have any questions, please contact me at (phone number and/or email address). Thank you for your attention to this matter.