Here is an interesting article from the Washington Post about some of the most evil Popes that have ever lived. This should give a good background about the Catholic Church leading up to the Reformation.

Need a review of the Reformation before the Unit 2 Test?

This document contains vocab and review videos linked inside that should help!

Here is a pdf review that glazes over the main topics.  

This is a 4-part review by Khan Academy that is really good!