My opinion
1 Notes portion.
They are not the full notes to the lectures. Missing slides from the lecture or are different slides completely.
2 Videos
They don’t cover all the questions on the tests. Also have a lot of filler content. I assume is because mandatory time requirements for the class.
3. Tests questions
There are numerous questions that could have more than one correct answers. Also that could have no correct answers. These questions lack more details to clarify situations for context.