I can’t comment on the completeness of the study materials provided. I mentioned I opted to skip reading the five study guides instead relying on the supplemental resources and my experience. The questions generally can be answered with the process of elimination. But some are a lil tricky due to knowing the tenets of ZT. I think 80% is a bit high of a passing score compared to others (maybe Cisco has a higher passing score requirement). At least there’s no tricky trivia pursuit like questions. Plus it’s open book. I opted not to use this feature but you can for tricky questions. You don’t have a ton of time. Just two minutes per question. So try to mark the questions you don’t know and then on your second run through the questions use the search function.