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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.
This is how you reach 1074:
75+64+82+87+82+75+73+28+83+32+91+78+58+73+93 = 1074
I fail to see what's confusing. Addition is commutative btw, it doesn't matter in which order you add them. The test is fine as it is.
Top-down or bottom-up doesn't matter, there is only one correct answer either way: 1074.