After the school year ends, this academic goodbye letter can be given with gratitude to a helpful tutor.
Dear {Recipient},
Now that the {term/semester} is coming to a close, I would like to sincerely thank you for being such a wonderfully patient tutor. In a school where classroom sizes and frazzled teachers would usually make me fall behind and give up, you really allowed me a second chance.
With the way my quiz and homework scores have been improving, I really think I have a shot at getting a {grade} this time, and I know that it is entirely due to your {frequency} sessions.
Thanks for forcing me to use my brain and to always {cite my sources/double-check the steps/etc.}
Sincerely,
{Sender}