Dear Allan.

Teacher, I submitted my final assignment two days ago.
I'm still not where I want to be, but I've been able to grow a lot thanks to your teaching. Thank you!

As I mentioned in our last call, I'm eager to obtain the certificate as soon as possible. Please grade it when you have time.
I will appreciate and incorporate the feedback you provided earlier. If I can pursue a career in teaching English later on, I aspire to be a teacher who can deliver effective instruction to my students.

Thank you for everything until now.
Stay healthy, teacher!