How to persuade professor to give me good grade?

Could you give me suggest to persuade professor give me a good grade?
I just want 5 sentences and each sentence does not over 20 words.
I hope the sentences to eliminate pompousness and wordiness.
Thank you a lot!
更新: I mean, I want to persuade professor give me a good grade.

and I just want 5 sentences.

for example:

I CAN DO BETTER in the future, when I get the professor encouraged!
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I need more reliant on passion and emotion.
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