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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.
There's nothing to fix, each language has hundreds of completions. Work on fixing your code. Experience and level are different things, and for this kata, a warrior starts with 100 xp, not 0.
It's not efficient enough then.
That's part of the challenge: to generate a code that runs quickly enough.
It's not a bug, it's a feature :)