Need some good supplemental reading material

  1. Im currently in my second semester of clinicals at a technical college and things are beginning to heat up. I am currently taking A&P, Basic Pharm., Fundamentals and Med Term. Im doing well so far, and am not to worried about comprehending the material, I am just wondering if anyone has a specific FAVORITE textbook or unrequired book that has helped them tremendously.....and does anyone have advice on currently working 25-30 hours a week (m-f) as a unit clerk....might that be a problem later on?