I just passed the 1Z0-060 upgrade exam required for OCP 12c few days ago.
The following link is all you need to prepare for the exam.
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Training (i.e. attending Oracle University classes) is expensive.
Hemant K Chitale
Please note that it's not only class, I already have the official course material from Oracle University, also hand's on experience and knowing the 12 docs is a must to pass this exam.
I think the classes (instructor led or lvc's) will start early next month.