别担心考试，尽你的最大努力吧。

Don't worry about the exam, just do your best.

youdao

今天尽你的最大努力去做好，明天你也许就能做得更好。

Do your best to do today, tomorrow you might have done better.

youdao

你可以尽最大的努力给面试者留下深刻的印象，不过最终常常只是视乎运气。

You can try your best to impress the interviewers but in the end it's often just a question of luck.

《牛津词典》

and you've tried to be the best girlfriend you can.

你也尽最大的努力尝试做一个好女友。

I can't 课堂 - SpeakingMax英语口语达人