JYN, you have to attend the class to understand all the info otherwise the book will just be information for you. The instructors give you tips how to memorise and relate information together. Group drugs together that are famous for major interactions, side effects.
The thought itself when you go home to study, you will always remember the instructor facial expressions when they stress out important facts. It is worth the investment for the test and for your future career. I've gone back to work and felt a major difference when I counsel patients. The pharmacist that I work with has been practicing for 16 years and I sure surprised her with facts she didn't know although she's brillant.