1. First of all,teachers must know their subjects very well. At a minimum, they should take several college courses and pass a written test in every subject that they teach. Also, they should take refresher classes every few years to keep their knowledge up-to-date. Third, teachers should take education classes in college to learn how to teach. Fourth, they should have spent at least one year practice-teaching. Practice-teaching is teaching real children in a real classroom under the supervision of an experienced teacher. Only after a person has met these requirements should he or she receive a teaching license.