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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 are so many top programmers without college education who do just fine without math.
You can't go very far away in coding without knowing maths at least at college level.
Use the function calls in the test cases!
No, it's not cheating in terms of CW rules. It can be frowned upon if you just copy and submit ready solution you found somewhere on the net, but as long as you only search for description of algorithm and implement it by yourself, it's pretty much OK.