You can describe something as prepared when it has been done or made beforehand, so that it is ready when it is needed. He ended his prepared statement by thanking the police
If you are prepared for something that you think is going to happen, you are ready for it. Police are prepared for large numbers of demonstrators unprepared
made ready or fit or suitable beforehand; "a prepared statement"; "be prepared for emergencies"
If you are prepared to do something, you are willing to do it if necessary. Are you prepared to take industrial action? = willing
equipped or prepared with necessary intellectual resources; "graduates well equipped to handle such problems"; "equipped to be a scholar" made ready or fit or suitable beforehand; "a prepared statement"; "be prepared for emergencies