This week's giveaway is in the Cloud/Virtualization forum. We're giving away four copies of Secure Financial Transactions with Ansible, Terraform, and OpenSCAP and have Lucian Maly on-line! See this thread for details.
Sorry i was away from this for a while. Devaka's post must've answered your question.
I did the SCJP5.0 so I'm not sure about the 6.0 exam, but I think working through lots of thread problems/questions should be the way to go.