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I made up my mind to study maths thoroughly, and get a good grade next time.

I've decided to work really hard on maths, next time I will definitely get a good mark.

i have determined to study mathematics hardly and i will get a good result

I set firm resolve to study mathematics well, will probably next time certainly test good result

I am determined to work really hard on mathmatics, and I will try my best to guarantee a good score next time.

My answer:"I am determined to make learning math, the next must be a good test results"