What state did you get the ticket in?
Was the actual ticket sited for 64 in 25?
You don't have any priors correct (no previous points on your record, right?)
How long have you had your license, and is your license currently some kind of provisional license? (if you're under 18. mostlikely yes.)
Any idea what zone you were speeding through? If you were marked for 25, is it classified as a 'residential' area / 'business district' / etc.?
answering some of those questions could help