I recommend college classes in general subjects related to medicine. You'd be surprised how much general biology, chemistry, anatomy, physiology, pathophysiology, nutrition, psych courses, microbiology and pharmacology courses will do for you and your patients.
Math courses sound silly, but most deaths in medicine are caused by simple drug dosage miscalculations. Your heart needs potassium to work, but too much of potassium is what the state uses to execute prisoners in many States. A simple miscalculation can be very serious.
English classes are crucial. A LOT of people in EMS are under-educated and come across as uneducated. How do you think that goes over with patients when you're trying to gain their trust?
An absolute must: take a legal course for EMS or first responders. I've only been in EMS for 5-6 years, and I bet that every 3 months, I get a request or order to do something that is illegal or unethical (but the people giving the order usually have good intent). Instead of keeping my mouth shut and feeling awkward, it's really nice to be able to point out exactly what the problem is, why it is illegal or unethical, and what steps we can do to prevent or remedy the situation.
Try to take as many 1-2 day CE classes as you can get your hands on. ITLS, PHTLS, GEMS, etc., are examples of good training that will help you in your everyday life as an EMT.
Take as many rescue-related courses as you can (rope rescue, ice and cold water, swift water, trench, confined spaces, Hazmat, Search and Rescue, technical rescue, etc...) Even if your everyday job doesn't include rescue, you really learn how to problem solve and think outside the box. You learn scene size-up and general impressions really well. You learn scene safety really well.
To your question about paramedic books specifically: it won't be as helpful as the other learning, but if it is the book you have or can afford, then, by all means, read it. Read anything you can get your hands on, and take as much training as you can afford. Create a lifestyle of life-long learning.
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