There is no end to practice of Kata. Eventhough a person has a high Dan, the act is never perfect. Practice is unlimited because Kata is for self improvement, mentally and physically. Yet, Kata has to be improved in different ways during each step as a beginner. When you have Kyu or Dan although you are performing the same Kata it will be different. Knowing different Kata does not mean you have a high Dan. In some foreign countries, they evaluate students by the number of Kata they know. It’s not how many Kata you know, but the substance of Kata you have acquired.
Gogen “The Cat” Yamaguchi