高考加油的英语表达可以有多种，以下是一些常用的表达方式：

Good luck on your exams!

You got this!

Go for it!

No problem!

Good luck on your Gaokao!

Best of luck.

Cheer up! Our troubles will soon be over.

Don’t let one failure discourage you, try again.

If there is a mountain, there is a way across it.

One mistake, more than a year of hard work.

Hang in there!

Come on! You can do it.

I'm so proud of you.

I'm behind you 100%.

I'll support you either way.

这些表达方式可以根据不同的场合和语境进行选择和使用，以传达你的祝福和鼓励。