If you aspire to be a Professional Engineer (PE) you buy your books so you can take them with you to the exam. Sure, you could check out a stack of books at the

If you aspire to be a Professional Engineer (PE) you buy your books so you can take them with you to the exam. Sure, you could check out a stack of books at the library the day before but then you're not familiar with where equations are, what example problems exist, etc.