If you're not planning on going into anesthesiology, you'll be an average student if you read up on your cases the night before.
If you're thinking of going into anesthesiology and want to stand out more, I would definitely read Miller's Basics of Anesthesia chapters on the following topics:
- Pharmacology (the chapters on inhaled anesthetics, opioids, induction agents, and NMBDs)
- Cardiovascular, pulmonary, and autonomic nervous system physiology
- Pre-op evaluation
- Airway management (airway assessment, the induction sequence, different airway management techniques that are commonly used, and the difficult airway algorithm)
Morgan and Mikhail is another good alternative; Miller's is way way overkill. Use whatever your school's library has. You don't really have to buy a book just yet because a lot of residency programs will either buy them for you or give you a 'book fund' for educational expenses.
You should also look on YouTube for videos that will walk you through common anesthesia procedures, like IVs, arterial lines, central lines, and endotracheal intubation.
Finally, if you really want to impress people, look up your next day's cases in the Anesthesiologist's Manual of Surgical Procedures (Jaffe). It's a great book that contains most common procedures and outlines what happens at each step of the case, and why it matters for your anesthetic plan of care.