When I read my assigned chapters for class, I would skim them once, then highlight them in yellow on my real read-through. Then I would go through with First Aid, and highlight in orange everything in First Aid. This helped me both at the time ("what do I need to really focus on and remember past the upcoming test?") and later now that I am adding into First Aid (a newer edition than I started with, but mostly the same stuff) and looking to my textbooks for deeper explanation.
Good luck!
Good luck!
