Participant agrees that the integrity of the Certification and fairness to all current and future students depends on the confidentiality of the content of the Red Hat Certified Engineer Exam, including the hands-on lab and written answer portions. Participant agrees to keep all content, questions, and answers of the Red Hat Certified Engineer Exam confidential. Participant will not share this information, either from memory or from notes, with any other parties, nor will Participant post information about the content of the labs or written questions or answers to the Internet or otherwise distribute information about the content of the Red Hat Certified Engineer Exam. Participant's continued compliance with this Confidentiality provision is a condition to the rights granted Participant under this Agreement, and any breach of that Confidentiality provision will immediately terminate this Agreement and may subject Participant to other civil claims.
Something like above policy applies for JB248 exam as well.
Confidentiality is the key.
Hence as suggested in the earlier thread: https://developer.jboss.org/thread/267192
The best way to prepare for this exam if to got through the various trainings/labs offfered by RedHat and to got hrough the EAP documentations.
Following link provides various options to get hands on on this via "Classroom", "Virtual classroom", "Online training" and "Onsite Training" options.
Above link also provide details about "How will you train/test?"