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The Katas main purposes are to display basic principles of judo, demonstrate proper execution of a technique, to teach philosophical in addition to preserving ancient techniques that are historical important to development of judo. It is a teaching tool, a learning tool, demonstration tool, tool to maintain tradition and a tool to develop new techniques and ideas.
In order for you to be promoted to Shodan, you need to demonstrate the Nage-no-Kata.
Click here for the textbook to help guide your study of the Nage-no-Kata