Good luck on your Gaokao! 高考加油/高考顺利！

Good luck on your exams! 祝你考试顺利！

No 2. Good luck for your exam and do your best.

祝你考试顺利，加油。

do your best=try your best 尽力而为/加油

No 3. You can do this. Best of luck.

你一定行的/加油。祝你好运。

You can do this/ You can nail this！

You've got this!

你能行的，你胜券在握！

No. 4 It's your lucky day.

这是你的幸运日。

No 5. Don't worry. I'll keep my fingers crossed for you.

别担心，我为你祈愿。

fingers crossed 中指和食指交织祈求好运(可以接人/物)

I'll keep my fingers crossed for your success.

我会祈愿祝你成功的。

No 6. I wish you success in/with your exams.

祝你考试顺利。

success前面可以加形容词来增加祝福程度

Wish you great/stunning success in your exams.

钟南山全英文采访：疫情4月有望结束

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