I will not make any excuses to my best teacher. You have forgiven me for some late work even my homework.
I do not intend to ask for excuses form my best teacher. You have already forgiven me for my late submissions.
You have been like my room teacher (basically it a elementary teacher mostly they are the best but you are even better).
... this sentence has many issues and I think you need to rephrase it all over again. This is what I suggest;
You are without any doubt the best teacher I've ever got.To be honest this is the only test i study really hard on( I did it too on the other CA but this one I study the hardest) .
Frankly, this is the only test I studied so hard.Well... it is very difficult for me to understand the purpose of this writing. When you make a post, either include your prompt or write a few lines explaining your purpose. Then we can help you better.
Good Luck!