E-mail to my teacher!

Hi miss
I'm writing to say I have a problem, it's that I can't attend the exam because I have to attend a different class that's important too. I'm really sorry for this problem.
I'd like to know If I could do the exam on monday. Otherwise, I could do any homework on monday, that could replace the score of the exam.
I'm looking forward to your anser. Hope you have a great time.

Maria Isabel Ordoñez