Dear {Teacher/School}
I am very sorry for cheating on the {test, assignment, project, etc…}.
I know that you, your classroom and {school name} has zero tolerance on academic dishonesty. In my ambition to receive recognition and a good grade, I lost sight of the fact that these things are earned and not freely given.
This ordeal has been very stressful, but I have learned much from this situation. Cheating—no matter the motives or the rewards—is immoral and unjustifiable.
{If applicable}
If you, my classmates and {school name} are willing to accept my apology, I humbly ask that you reconsider or lighten my punishment. The dedication that {school} has shown to its students’ learning experience is something I have a great and newfound respect for. I have learned much already, and I hope to continue learning from{school}.
Thank you for your time and I hope to hear from you soon.
Sincerely,
{Sender}
{Sender}