Segundo SCJP FAQ do site da Kathy Sierra:
How is the SCJP 1.6 exam different from the SCJP 1.5?
* Exam objectives: Several new API classes/interfaces have been added: java.io.Console, java.util.NavigableSet, java.util.NavigableMap. Explicit garbage collector calls (i.e. System.gc()) will no longer be tested, but candidates will still be expected to understand garbage collection and the finalize() method. Also, the following topics will be tested in greater depth: exception handling, collections, assertions, threads, and flow control. See the SCJP forum for more details.
* Number of questions: 72 (no change)
* Time: 210 minutes (increased from 175 minutes)
* Passing score: 65% (increased from 59%)
* Format of questions: No change.
Abraços
João Sávio
João Sávio's blog 
I’ve read that on the SCJP 5 Study Guide Book, and liked, but, why it isn’t used normaly?
In fact, assertions are usuarly used to make tests!
Sávio
Sávio
The Oracle web site informs that the passing score is 58.33% not 65%.
Regards,
Eduardo