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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Ranks of approved katas cannot be changed. FYI, see this to understand how katas are ranked: https://docs.codewars.com/concepts/kata/beta-process
If you are not happy with rankings, the only way is to get involved in beta validation process.