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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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For the last one: you forgot to count the substring 35.
The question says to count the ODD-NUMBERED substrings. 4 and 134 are not odd-numbers and should not be included.
Probably misreading the logs, read this: https://docs.codewars.com/training/troubleshooting/#print-input the tests are fine and the one with 5 as input expects true, not false.