I recommend this good book to help you study the oracle 12c new features included in the OCP 12c upgrade exam :

OCP Upgrade to Oracle Database 12c Exam Guide (Exam 1Z0-060)

Each of the following flashcard is a synthesis of one or more chapter covered by the book, they are tools to review the chapter but do not replace reading the book.

New Features of Oracle Database 12c

1 – Enterprise Manager and Other Tools
2 – Basics of Multitenant Container Database (CDB)
3 – Configuring and Creating CDBs and PDBs
4 – Managing CDBs and PDBs
5 – Managing Tablespaces, Common and Local Users, Privileges and Roles
6 – Backup, Recovery and Flashback for a CDB/PDB
7 – Information Lifecycle Management and Storage Enhancements
8 – In-Database Archiving and Valid-Time Temporal
9 – Auditing
10 – Privileges
11 – Oracle Data Redaction
12 – RMAN and Flashback Data Archive
13 – Real-Time Database Operation Monitoring
14 – SQL Tuning
15 – Emergency Monitoring, Real-Time ADDM, Compare Period ADDM, and Active Session History (ASH) Analytics
16 – Resource Manager and Other Performance Enhancements
17 – Index and Table Enhancements
18 – ADR and Network Enhancements
19 – Oracle Data Pump, SQL*Loader, External Tables Enhancements
20 – Partitioning Enhancements
21 – SQL Enhancements