I am not a native speaker of English.
Now, this was the conversation:

> 
> A: How was today's exam?
> 
> 
> B: It was just okay.
> 
> 
> A: Well, you've got 2 more, right? You'll do well in those. Now when you say "okay" I believe yesterday's wasn't bad either. Anyways,
>  *chill*. Good luck with your next exam.
> 
> 
> 

Now, is the usage of *chill* appropriate in context?

Also, how acceptable is the reply by A in terms of selection of words (again keeping in mind the context)?