How important is reading the whole chapter for your class? In my class reading the whole chapter is not necessary and just bogs my mind down with too many details. Does your professor hand out study guides or anything? My A&P grade went from barely holding onto an A- to having a solid A once I figured out what to study rather than studying everything. This may not work for you as everyone learns differently. The reading may well be completely necessary for your class. But it's possible that it's not and you're studying everything rather than what you specifically need to be studying.
Also, acronyms have been a life saver. I use them all the time for memorization.