the more tougher the courses are, the more the questions in the exersices are harder than the videos

im doing ap college pyhisics 1 and the exersices have problems that they didnt even cover in the video, or they don't explain much detail on them. the videos are using easy examples but the problems are much harder. long ago, i did the 6th grade math course and the questions were very aligned wit the videos ad easier to solve because the video covered it.