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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.
The tests apply several ranks to your class in order, so the end result of the progress will not always be only the progress gained from that rank application.
In this example it seems you had a User object in the state where the rank was -7 and the progress was 70. So that when a rank of -4 was applied you are intended to gain 90 progress, rank up to rank -6 and have 60 progress remaining.