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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.
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Syntax for classes more than actual OOP. So I would agree that 8kyu is not that far-fetched.
Kata description is "Given an array with exactly 5 strings". And there is no specifications / requirements how the method should work if the argument array contains different number of strings.
Will fail in case (A x B) < C
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https://docs.codewars.com/training/troubleshooting#print-input