In terms of absorbing information, I'm best as just doing readings and listening to lectures. Listening to lectures is a lot easier if there's an actual interest in the subject. Some lectures are just painful to listen to, but the reward of a nice grade is a good incentive. lol
Overall, though, the best thing for me has been discovering my learning type, or at least random things that help with learning. Like I'm best at doing readings and listening to lectures, but what actually helps me accomplish those things do not depend on reading and listening. It actually depends on eating, listening to music, and moving my body a bit while reading or listening. (Whenever I take a test I'm always drinking coffee because of this. Or chewing gum in class. lol)
So since you're going to have to do memorization, listening to lectures, etc etc anyway just to fulfill the requirements of the class, don't focus so much on the literal action of reading, writing essays, listening to lectures, doing homework, etc, but what sort of environment you need in order to focus. That'll take experimentation, though. Like, I had to learn by getting a C on a midterm that writing down my ideas while reading doesn't do anything for me, and for a different test, I learned that movement while studying does do things for me because I was engaging with the material so much better by randomly doing push-ups while working. idk it works, so I don't question it. lol
I've found the most important thing is for me to theorize and conceptualize the material, but it's just getting me to focus on that activity of theorizing and conceptualizing that gets tricky.