DUI rejection means you refused to take the exam. DUI first an initial violation. DUI second is 2nd DUI within a 5-year time frame. DUI 3rd is a 3rd DUI or more in 5 years. Aggravated DUI is a felony along with the 3rd. Aggravated indicates you injured somebody and were consuming over the legal limits.
I have seen folks founded guilty trying to represent themselves as they do not know the law and rules of evidence. As a DUI attorney I stay on top of these things and utilize it for my clients to get the best feasible outcome.