[java] Java2 testing

Hello Folks, I need to take a TeckChek test for Java 2 for a potential employment opportunity, and I was wondering if anyone had taken one in the past, and if so, what should I expect to be tested on? What should I study? Do you think I am going to need to know the Java 2 API as well as the fundamentals, and if so which packages would you study the most. Thanks for any tips on this. A