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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.
Not a kata issue, you're not understanding the task. Read the instructions again.
150 Should return no in the first test [25, 25, 50, 50] 25+25+50+50 = 150 and should return "NO", this issue is easily fixable but still a good question :)