Any student who is not required to hand in written homework based on the reading assignments in a course will not complete all of the reading assignments  Even highly motivated students will neglect their reading assignments if they are not required to hand in written homework
Ttherefore, if the students in a course are given several reading assignments and no written assignments, no student in that course will receive a high grade for the course
No student who completes anything less than all of the reading assignments for a course will earn a high grade for that course.