If I were you, I'd just go to the exams office (if your school doesn't have one, see the person in charge of exams or just ask at office) and explain to them, they'll sort it out for you. The most important thing is your candidate number. Aslong as you've done your candidate number correctly, and your signature, they'll know it's you. I once wrote Becky rather than Rebecca on an exam(oops) I still got my result back for that exam with no problem. good luck!