Hi Emily,
I felt the same way too. Although I passed all of my tests my scores are not where I want them to be. I felt that some of the questions weren't covered in the chapters. I'm about a month in and is still new to all of this so I'm still learning as I go, but meanwhile I reached out to an Instructor just to be sure if I needed other literature and he said that everything is provided through the digital study guide for the Business Management Certificate program.