I have the paper book version of Oracle Certified Professional Java SE 8 Programmer II Study Guide. The book says it includes a access for an interactive learning environment. But in order to access those content I have to enter a unique PIN. I couldn't find anywhere in this book.
Where is that unique PIN appears in the paper book?
Indeed an interactive environment. You gotta check it out.
Go to https://sybextestbanks.wiley.com/ and select the OCP book. Then you will get a prompt to register. When you click next you will be asked a random question from the book. Once you done with it, you will receive an unique ID to the given email address. By using that ID, you can simply login to that and enjoy!