Hi steve jhonson,
1) OCA 7 : 1.3 Create executable Java applications with a main method; run a Java program from the command line; including console output. is now --> OCA 8: 1.3 + new topic
For the above objective , you need to know how to compile java file and how to run it. I mean javac , java commands . You also need to learn about main javac commnad options (ex: javac -cp Test.java) and java commnad options .
2) OCA 7 : 1.5 Compare and contrast the features and components of Java such as: platform independence, object orientation, encapsulation, etc. is now --> OCA 8: n/a - new topic
For the above objective , You will get knowledge when you are preparing Java features and OOPS concepts.
5) OCA 7 : 9.5 Write a simple Lambda expression that consumes a Lambda Predicate expression is now --> OCA 8: n/a - new topic
For the above objective , I can suggest you the link
Java8_Lambda_Expressions.
3) OCA 7 : 2.5 Use call methods on user-created wrapper class objects (grammatical error reported to Oracle - think this means primitive wrappers is now --> OCA 8: n/a - new topic
4) OCA 7 : 9.3 Create and manipulate calendar data using classes from java.time.LocalDateTime, java.time.LocalDate, java.time.LocalTime, java.time.format.DateTimeFormatter,
You can also get good information Oracle website
Java_Tutorial
It would be better if you refer OCAJP8 by sybex which is written fully OCAJP8 point of view.
Hope this helps !