Notes for my major or minor I would go through, look at the courses I had yet to take, and keep the pages that would be good background, minus those that were from the textbook (assuming it had a decent index). Kept the textbooks that provided the basic information as overview to jog my memory and anything that I could use as a reference in a paper for a later class. For gen ed, depended on how much the study applied to what I’d be doing and how quickly I’d need the information if it came up.
Notes for my major or minor I would go through, look at the courses I had yet to take, and keep the pages that would be good background, minus those that were from the textbook (assuming it had a decent index). Kept the textbooks that provided the basic information as overview to jog my memory and anything that I could use as a reference in a paper for a later class. For gen ed, depended on how much the study applied to what I’d be doing and how quickly I’d need the information if it came up.