hey dont stress it's really not that hard, really straight forward, like cimbom said, and for the extended response you really could just learn the corresponding chapters from the textbook, and drop a few scholarly references (no need for years and page numbers though) and empirical evidence/data if you want to try and show off (good for institutionalist economics, for instance, which I did my extended response on), but for the extended response, it's more important that you show your understanding of the school of thought, and how to 'use' its perspective, check out the course criteria in the handout.
Just remember, there's only so much you can write in 10 minutes for one question, but you can still say a lot as long as you don't waffle.