How is it you think that is evidence somehow? You might as well conclude that having a unicorn as your school mascot is why kids do so well at that school. http://www.tylervigen.com/spurious-correlations

There are so many confounding factors that could be causing students to do better in those schools.

Here is my take away from your 'data': Imagine how much better those students would be doing if they also weren't getting up earlier than is natural or recommended.