Is it possible to make an affidavit?

My late grandfather's name (Mother's father) in my mother's matriculation certificate and mark sheet is spelt wrong. My mother passed matriculation in the year 1982 from West Bengal Board of Madrasah Education. After 37 years its very tough to change her father's name in mark sheet and certificate. Suppose my grandfather's name is Mr X Y Z, and in certificate it is printed as Mr Y Z. So my questions are 1) Can my mother make an affidavit stating "In my matriculation certificate my father's name is misspelt. Mr X Y Z and Mr Y Z is one and same person". 2) And will that affidavit be useful if she has to show the matriculation certificate somewhere?