If the books do NOT have access codes, do not buy the full price at the bookstore. Use Amazon instead. It's a fucking ripoff when I bought this book at my campus (Investigating High-Tech Crime: Michael Knetzger, Jeremy Muraski: 9780131886834: Amazon.com: Books) for $77.00 and at the end of the semester only got $5 for it.
Also do not spend your aid money on unnecessary items, you'll just end up in more debt. It's best if you can find a part time job.
Do not skip class either, it can hurt you if you're on financial aid.