Upvote:3
Here are references to some studies on this. I don't know how rigorous they are!
An abstract of a study: http://pss.sagepub.com/content/early/2013/03/27/0956797612459659.abstract
Two articles in the Huffington Post that reference studies. I imagine trying to google the universities and professors involved might get you some abstracts or summaries of results:
http://www.huffingtonpost.com/2013/04/20/meditation-better-grades_n_3053719.html