This week's book giveaway is in the Android forum. We're giving away four copies of Android Programming: The Big Nerd Ranch Guide and have Bill Phillips & Chris Stewart on-line! See this thread for details.
the CX-311-085 is the SCWCD6 (JEE6) exam and the CX-310-083 is the SCWCD5 (JEE1.4) exam.
Head First prepares you for the SCWCD5 exam but is a good basis for the SCWCD6 exam. Although you need to prepare for the new EE6 features by reading the specs. As far as I know there are no SCWCD6 specific books yet.