How does rank work riot?

Well I played my 10 test matches, won 4 out of 10 games got put to b5. Then my brother did his 10 test matches and won 0 out of 10 and got put to a higher rank why is that ??

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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