if you are ready, you are prepared for what you are going to do
Come on. Aren’t you ready yet?
When the doorbell rang he was ready and waiting.
ready to do something
Everything’s packed, and we’re ready to leave.
Why does it take you so long to get ready to go out?
ready for something
I don’t feel that I’m ready for my driving test yet.
I felt strong, fit, and ready for anything.
ready with something
At the end of the lecture, I was ready with questions.
make ready (=prepare to start doing something)
We made ready for our journey home.
when you’re ready (=said to tell someone that you are ready for them to start doing something)ready when you are (=said to tell someone that you are ready to do what you have arranged to do together)