Illinois State Test Exam

Hello everyone
I tried to pass an IL state exam and failed three times with the same score. My question is how does the system grades the test and how does it give the exact score at the end? Could there be any flaw in the system? I took it three times and failed with the exact same score of 110 of 140. I would assume that it should be a different score with every new attempt as there are different questions. Did anybody had similar situation?
Also, many questions I found on test were not covered in InterNACHI course. Can anybody suggest how to prepare for the test? Did anybody use a personal tutor to prepare or is there any book to read?
I passed all the preparation tests on InterNACHI with the score of a 95-100 but it didn’t help. The questions on the state exam are so much different. Need help!