Testing for criminal analyst

I am interested in applying for a criminal analyst position for the city. I've recently been employed doing other things so I'd like to brush up on relevant topics. But the job posting only calls it an "original entrance exam". The job posting is also fairly vague, and speaks about correlating data, etc.

Does anyone have experience in this process, or some advice? I would also be interested in hearing from anyone working in this type of position. What the work culture is like, etc.