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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.
I don't believe there is a bug on this test. I thought there was a problem with the test as well, so you might be making the same mistake I was making. A possible hint to the solution is to be as greedy as possible when it comes to using 25 dollar bills for change. Try to return change that uses the least amount of 25 dollar bills as possible.