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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.
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Look at the top of the page and see how many guys passed the kata. Please follow the advice given above.
Most probably not, and how do you think someone can help you with no info about what tests you think are incorrect? Please read the instructions again (a gap can't have a prime number in between) and the posts already here claiming wrong tests, see if what you think is wrong is not covered on one of them, and then use Question label (instead of Issue, there are already 460 completions on Ruby) if you don't understand a test.
Tried to solve but some of the test cases are incorrect.