中译英：我下决心一个月之内在功课上赶上同学们。

I've made up my mind to catch up with my classmates within a month.
“在功课上”不用刻意翻出来~
made up my mind也可以改为determined
I'm determined to catch up with my classmates within a month.

I made a decision to catch up with my classmates in studying in one month.

I made up my mind to keep up with my classmates in one month.

I determine to catch up with my classmaites in one month.

我下决心一个月之内在功课上赶上同学们
I be determined in a mouth in school lesson go th catch up with schoolmate eses.