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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.
Do you mean that, when you press "Test" your solution works, but when you press "Attempt" your solution fails?
If so, that is possible - the "Test" part only contains a few fixed/specific tests; in the "Attempt" there are many random tests, including configurations that you may not have thought about/implemented correctly.
...what?