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

Children are hard at work in the study hall.

孩子们在自习室里刻苦学习。

《柯林斯英汉双解大词典》

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

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

However, the scientists involved in the study believe nature may have already done the hard work, with reptiles making the toxins safe for their own use.

BBC: Snake venom may be 'drug source'