Your father is annoyed with you for not doing well in your last examination. Write a letter to him explaining why you could not have done better than you did
Since this seems personal, i suggest you have a genuine conversation with him instead of shoving words into a letter. It won’t even be extremely believable, since apparently you aren’t the best writer. Best of luck though
mr kwame am very sorry for failing my examination because I didn't not learn well can you please forgive me. I please I will do my best next time.thank you