How to write a better e-mail?

Can you please help me revise this paragraph, I want it to sound polite while having a strong impact on him. Also, I want it to sound less begging and more if he changes my grade he will be doing himself a favor.



This is the e-mail:



';I do not want to look back at this grade with agony and discomfort. This is my lowest mark I have ever received and it will hurt me dramatically in the future. Therefore, I would like for you to help me like you have helped my other fellow classmates who have talked so highly of you helping them.';



Thank you!How to write a better e-mail?
If this email is to your English teacher you may be well advised to take heed of the low mark you have been awarded. Your lexis,syntax and grammar all show serious flaws. You need to bone up on this stuff or you will not cope well with University standard written work. This is perhaps what your teacher is trying to convey to you with the failing grade. Take some extra courses in the evening or get a tutor. I am not saying this to be cruel. I really believe you need some remedial help.