Totally up to you. We can't tell you what works for you and what doesn't. I don't learn well from reading, I learn best from lecture so I did minimal (no) reading for my courses. When I did do the reading I always took notes, because then I could go back and review them as though they were lecture notes 🙂
There are also online resources for teaching yourself shorthand and better note taking techniques. Unfortunately, it is important for you to struggle with finding a good way to retain information on your own. If you put in the effort now and figure out how you learn best, you can apply that knowledge to future coursework so you don't waste time/energy later.