Nice to see the new Developer Open Assessment on the site. May I suggest that you provide some recommended reading or links to other material that that is worth studying before taking the test. The only recommended reading I could find was to review the Scrum Guide but that does not (intentionally) say anything about engineering practices so it cannot be used alone.
10:53 am January 4, 2013
Thank you for your message. Work is underway to publish a Book of Knowledge list for the Developer Open and general Scrum Developer knowledge on Scrum.org. An announcement will be made via our twitter feed within the next week or so.