Just in case you don't know how the test is set-up, I think sometimes that makes studying easier.
It is a 50 multiple choice test that is divided into 5 sections of 10 questions. (Or at least it was last time I took it!) One section for each event and one section on "general".
In the general section it is always a good idea to know the chief judge deductions: failure to remove boards/mats, coaching, excessive chalk, failure to salute, beginning a routine prior to the chief judges signal, etc.
There will be a few questions that say things like "If a gymnast has bent legs, bent arms and two steps on her landing what is the maximum deduction that can be applied?" (Obviously a random very made up question.) But, a lot of the questions will be multiple deductions that you just have to add up the maximum.
Additionally, I had mentioned before, there will be questions on beam, fx & ub about the order of elements. "Which of the following is the correct order of skills in the L6 beam routine?" Then it will have like 4 skills in different orders and you have to pick the right one.
Good luck! Don't stress about the test, I think you only have to get a 70% to pass, so if you know the major deductions, the chief judge deductions and the routine order you will be fine. Be sure to let us know how you do!!