What do you do with your books? Do you keep them in school so you can refer to them throughout the day? Keep them at home so you can study? Shlep them back and forth every day?I want to utilize my time in school as much as possible, and sometimes if lecture is boring or repetitive, my time can better be spent reading and reviewing the text. But I don't want to be carrying heavy books back and forth, and I'll also need to do some studying at home.I'm thinking about buying a second copy of each book, an older edition for very cheap, and keeping one set of books at home and one set in school.