Hey there Ruby. Yes, you can say "you too," but that's usually if you're good friends with the person, like a good friend or a best friend. A couple of other responses you can do are: "Thanks/thank you, you too." This is a great thing to say to anyone, even if you don't know them that well. "And the same to you" is a more formal version of the above examples, but I prefer it because you literally saying "I am wishing you luck as well." Hope this helps!

Yes, if you are both about to take a test, for example, then you could say 'You too' to the other person. Or if it's just you who's taking the test, then you'd simply say 'Thank you.'

can we say, " to you too" or "to you to my freind" my best freind...