Smith: Hi, Luis. How are you doing?

Luis: I am doing fine, thanks. How about you?

Smith: Great, thanks. By the way, how was your English test? Have you got the results back?

Luis: Yes, I've got them. You know that? I got the highest score in the class. I'm so happy right now.

Smith: That's great. Congratulations on your success! By the way, what's your score?

Luis: Unbelievably, I got 100.

Smith: Wow, that's great! You are really smart.

Luis: Thanks for your appreciation, Smith. You are so kind.

Smith: Don't mention it, Luis. I wish you will be an English lecturer in the future.

Luis: Well, I wish so. Thanks a lot.

Which expression is used for expressing congratulations?