An advice regarding the Madina Book series

Some students assume that if you understand the main passage from the lesson, you are entitled to skip the excercise section (التمرينات). This may be true for other books, but not with this series; that is because the excercise section can sometimes contain new rules that are not covered in the main lesson. For example: In main section of lesson 27 the author does not mention anything regarding ظن and its sisters. This rule is only covered in the excercise section. So if you had skipped the excercise section, you would have missed out on this vital rule.