About content integrity

Hi, ı was studying diferantial equations for my exam. But, ı could not be sure all topics is inclued or not. I mean weather ı will be ready for my exam basicly after watching all videos in https://tr.khanacademy.org/math/differential-equations here for example or not. I think if all topics are not include, it should be written on the site 'all topics are nıt included.' or it can be written the missing topics titles to be inform students.

Thank you, good works!