Training ibm.com
This mastery test is based upon the Introduction to the New Mainframe: z/OS Basics textbook (706 pages).
It's available (as a PDF download or available in hardcopy for a fee) on the IBM Redbooks website as SG24-6366 at this URL: http://www.redbooks.ibm.com/abstracts/sg246366.html
It is strongly recommended that you thoroughly review this textbook prior to attempting the exam.