Unless you give some time and work for it, the issue is going to haunt. First go to school and check the records of correct spelling.
Get a certificate from the school that as per their Registers your name is spealt properly addressed to Board.. Also inquire in school about the procedure for correction at the Board.
Enclose your AADHAR, copy of certificate given by school, your DOB Certificate (Registarar) and request Board to correct your name in the marks suitably at the earliest.
Wait for a month and then file application seeking information under RTI about action taken on your letter with Rs.10/- adhesive court fee affixed on your application.
Needless to say that entire correspondence should be only through Regd., Ack due.
You have passed in 1995 and raising the issue after a decade, during a time when there is utter confusion in Board due to bifurcation and division of functions in between states and when there is dumping of records. Be patient and correspond promptly.