In the table of the contents of the book, we show what topics in the book you need to read about for the upgrade exam. Seven of the ten chapters contain at lest one topic and some many topics. The reason for this is that Oracle added lambda/method references/functional programming constructs to many different topics and included them on the upgrade.
We also have an extra Appendix devoted to those taking the Upgrade 6 -> 8 exam, as Oracle chose to add a number of new objectives for this test, some of which were previously on the OCP 7 exam.