"加油" (jiā yóu) is a Chinese phrase that means "to cheer on" or "to encourage." If you want to say "good luck" or "do your best" in Engpsh, you can say "good luck" or "do your best" tomorrow.

Here are some other phrases you might find useful:

Keep up the good work!
You can do it!
Keep pushing forward!
Don't give up!
Keep striving for success!

I hope these phrases help you stay motivated and encouraged as you study Engpsh. Good luck!