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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.
How else would you calculate a percentage?
Think there is something going awry in the test. Even in the instructions it says, whoIsNext(["Sheldon", "Leonard", "Penny", "Rajesh", "Howard"], 52)=="Penny", and when I run that test it says "expected Sheldon".