All Oracle student guide:-

Oracle Database 11g Performance Tuning(1z0-054)

https://drive.google.com/drive/folders/0B8-3R318F39hSHUyQnV1blU4U0k

Oracle 12c RAC (1z0-068 )

https://drive.google.com/drive/folders/0B8-3R318F39hcF95MkYzb3NHVmc

Oracle 12c Performance Tuning(1z0-064 )

https://drive.google.com/drive/folders/0B8-3R318F39hZ2xHZnJIUWhMRFk

Oracle 12c New Feature(1z0-060 )

https://drive.google.com/drive/folders/0B8-3R318F39hQU1kSkRqcFFtUG8

Oracle 11g RAC(1z0-058 )

https://drive.google.com/open?id=0B8-3R318F39hOHhFZU9LOTl3TWs

Golden gate 12c(1z0-447 )

https://drive.google.com/open?id=0B8-3R318F39hWUlmMlJNYk4tZEE

Golden gate 11g (1Z0-481 )

https://drive.google.com/open?id=0B8-3R318F39hTmdrRVZhVXg0cms