Pool textbooks with friends
The first thing you’re going to learn about college is that books are the most needlessly expensive things in the history of college. Seriously, this is especially true if you go to a college that demands you get special versions of books that were made JUST for your college that are stupidly hard to try and sell for any kind of money back.
One of the saving graces about those text books, though, is that the difficulty to sell means that it’s pretty common for friends to need the same book, either in the same class or in different semesters. If you don’t have the cash for all your books, ask around and see if you have any friends that had that class before you, or are in the same class, that you can share with or borrow from. Likewise, if you keep any of your books, consider loaning them out to your friends who are in classes you’re done with. Keep in mind that generosity pays, in college.