'Beware of false knowledge; it is more dangerous than ignorance'. - George Bernard Shaw.
By Determination one can Accomplish anything
Do you have the copy of your Hall Ticket? Was your name spelt correctly on it?
Also, get in touch with your school and collect documents pertaining to your schooling. Get a letter from the principal on the school letterhead, with all your details clearly mentioned, This will come handy when you submit an application to the Education Board office for correction of name.
"A love affair with knowledge will never end in heartbreak" - Michael Garrett Marino