I had my exam on Friday.
Quite interesting topic but very intense exam - only 2 hours to complete all the tasks.
The only book I used was the "Administration guide" from RedHat site.
The testing environment:
8 KVM VMs with 4 bricks each based on Centos 6.6 with GlusterFS 3.7 from
Storage for your Cloud. — Gluster (1CPU, 1GB RAM, each brick - 1GB of HDD - vdb, vdc...)
But I strongly recommend an official version from RedHat (evaluation is available from the sales representative)
I'm still waiting for my results.
EDIT: Status -passed

RHCA Level 2 achieved.
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Regards