I would advise doing an outline for each chapter. It will help a ton in the long run because an outline would make sure you cover every important topic. Plus then you will have those notes to go over when studying for finals. The only problem is outlines tend to take a long time to do...
I suggest if your reading every chapter anyway to just write a brief summary of every topic heading to help remember. If your more of a visual person just take some maps, charts or tables off the internet to look over too. That and a list of key dates, terms and people would be more than enough to ace your test and should only take about an extra half hour on top of your reading. Good luck!