He could work hard and study hard.

他还可以一边努力干活，一边努力学习。

youdao

To master a foreign language like English requires hard work, so you can't study too hard.

掌握一门像英语这样的外语需要勤奋学习，因此你再怎么努力也不为过。

youdao

This is one of my New Year wishes, now I want to study hard, work hard, I hope my wishes can realize, grew up when a teacher, let my life leave some brilliant!

这就是我的一个新年愿望，我现在要好好学习，努力拼搏，希望我的愿望能够早日实现，长大当一位老师，让我的人生留下一些辉煌！

youdao

and just, you know, work hard and study, do your homework, eat well too, I'm sure that helps

所以，我的建议是，努力学习，认真完成作业，
同时也好好吃饭，这真的很重要哦。

如果是在考虑留学 - SpeakingMax英语口语达人

But also to teach him discipline and to work hard and to study hard

但还要教会他纪律、努力工作和好好学习，

要成为好爸爸 - SpeakingMax英语口语达人

And we expect people to earn it -- study hard, work hard for it.

WHITEHOUSE: President Obama Speaks on the 2013 Budget

We couldn't afford to tell those kids on the West Side or the South Side, if you work hard, if you study hard, if you're hitting the books, that you're going to be able to afford to go to college.

WHITEHOUSE: Remarks by the President at a DNC Event

The study concludes that more than hard work, entrance into the middle class depends on the choices parents make for their children.

FORBES: 6 Milestones for Entering the Middle Class