Here are some tips I've learned over the years:
1. Textbooks: compare pricing! There are tons of rent options, but sometimes I found my textbooks cheaper to buy on amazon and as an amazon prime subscriber, shipping was free.
I've used all 3 of these - and ALWAYS compare the different pricing including shipping before I order.
www.chegg.com - rent books
www.textbookrentals.com
www.bookrenter.com
2. if you don't already, register for amazon prime student. $49 a month. You will need to confirm your student email address.
3. Follow a zero balance budget, meaning every single dollar of your allowance/income is accounted for. A popular method is to use cash for everything that you separate into envelopes or some other organization method. Each category of your budget has its own pile of money. Spend it wisely. You aren't allowed to dip into any other category when you overspend. This will require you to be very honest about how you spend your funds. Also, since you are a college student, it very well may be the truth that your expenses are such that it's just impossible for you to save anything. The important part about savings is to establish the emergency fund first. The first goal should be to have $500 set aside. When you reach that goal, then increase it to $1000. YOu should only dip into this fund for car repairs and such. This is not to cover the last-minute invite to a weekend in Ocean City. (not that I would judge you for doing this as I've been known to do it in my past LOL)
4. Self awareness is key. Understand your spending habits. Identify the areas where you think you spend too much. Find ways to reduce it. For instance, if you find that you spend more money on going out than you want, perhaps pre-game at home with a couple drinks so that you're only buying one-two drinks out at the bar. If you eat out too much, simply set a schedule of how often you want to eat out and at what cost. Whatever you do, don't beat yourself up.