Here are some links to some other resources.
No endorsment nor ranking is implied by the information
Programming tools and documentation
Several resources are available on the Java website at Oracle. Most importantly,
you can download
the latest Java Development Kit (JDK), and read the Java platform
documentation. If you download the JDK, be sure to get the latest version.
The certification exam is provided by Oracle University, and is
administered through Pearson VUE. More information on how to take the exam can be found here.
The main page for Java Training from Oracle University provides the links to Java certification. For instance, information about the SCJP/OCJP 6 exam can be found here.
Sites with extensive Java Certification resources
(Online discussion forums, study groups, sample exams, etc.)