Is my short essay is correct ?

From the bottom of my heart. I will challenge myself in achieving the best results with flying colors . I want to be in the Top 10 students of Form 5 . I know patience is half of a man and I will try my best to get a the best results . In the nick of time, I will do more revision without non-stoping at all .

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Great job on your essay! The reason i changed struggle to challenge is because i think it fits better with your essay. Since your striving to be the best in your Form and you seem motivated. If you do want to use struggle in that sentence you'd have to phrase it something like this  "I struggle in achieving the best result in flying colors" . Which that maybe what you meant.