The Illinois CNA test is not administered by a third party unlike the majority of the states. Instead, it is independent and administered by the Illinois Department of Public Health. There is an 85 question sample test that is available for prospective test takers, but according to them, none of the questions will be on the exam. On the other hand, use the exam to familiarize yourself with the exam structure in order to maximize your chances of passing the real test.
Click here to visit the Illinois CNA testing program site where you can find general information as well as the practice exam.