I'm late to the question by a lot, but thought you still might appreciate this short (16 mins) webinar on sharing data with teachers, principals, and administrators. Probably would have been helpful earlier in the year for the diagnostic side of things, but perhaps still of use to you.
Did you wind up using Tableau's R integration after all or did you stick with MicroStrategy? How's it working so far?
I have changed from MicroStrategy to Tableau and wonder why I waited so long to change.
That said, I am struggling bringing R into Tableau and ask that Tableau take a step back and developed some detailed and easy to follow instructions on how to integrate R will some fully developed examples.