You : I heard you are going to have an exam tomorrow.
Friends : Yes, I'm quite worry about it.
You : Good luck.
Friends : Thank you.
You : Are you ready for a test tomorrow?
Friend : No. I'm afraid not.
You : Come on. I am sure you will do well.
Friend : Thank you. I hope so.
You : Don't study too hard. It's not good for your health
Friend : I have a test tomorrow.
You : Really? Wish you luck my friend.
Friend : Thanks.