The professor should write a meaningful intro text book and deliver it as a pdf, rather than use some $400 Wiley textbook they get a kickback from and the chapter and questions get resorted each year so that used books are useless. This is all a racket. Does anyone think that the 25/30 remedial students are going to pay for a $400 or more textbook when they've got more immediate needs (shelter, food, clothing) to pay for?