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)?