Tested with two local departments, pretty much same test both times. Reading comprehension, some which word fits best, think there was some math and one other basic component. None of it was really LE related. The sentences or paragraphs may reference law enforcement topics, but LE knowledge was not required from what I remember. Your particular department may be different though.

Business casual was the norm for people that were testing. Some came in full suits, but it didn't matter for that portion of the testing.