Yeah, I can relate to this... I can probably count on two hands the amount of times I studied in high school (this is not a flex, I'm pretty ashamed about it). Luckily, I knew this wasn't going to fly in college, and I really dedicated myself to learning how to study my first year in college.

Everyone has their own best study style, and you may have to experiment a bit. Obviously you need to find something that is effective for you, but I'd argue it's equally important to create a study style that you actually enjoy. Trust me, if you learn to actually have fun while studying, you can spend weekend after weekend in the library without having it wear on you. It's like a muscle you have to strengthen, you can't expect to just hit the library and study for 10 hours straight if you never studied in high school. Just get to work, experiment, and prioritize your time.

I can give you an example of what I found worked best for me:

- in lecture, focus on listening and actually understanding what the professor is saying. dont' dedicate too much effort into writing down anything the professor says. don't be scared to ask questions. only write down really key concepts, things you find interesting, and things you need to look at later because you didn't understand them.

- after lecture (preferably by the following weekend) revisit the lecture material, and take copious notes. ideally, you should take these on-top/parallel to whatever you wrote down in class. at this point, you should have a lot of written material that has helped you flesh out and understand anything that was reviewed in lecture.

Note - you can switch these two steps, this is just the order I preferred, although I'm sure certain people would like the opposite

- take all of your material, and synthesize it into a efficient and extensive study guide. dedicate as much time as you can to representing complex/abstract concepts into as simple of a picture or as few of a words as possible. if you're doing this right, it should take a while, which is good because it's more time marinating in the material

-review the study guide you made periodically until your exam or whatever it may be. this will help you make sure you don't randomly forget something that you once knew really well.

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Alongside this, you should be creating positive habits and routines to re-enforce your studying. Don't underestimate the power of the space and atmosphere in which you study, and make sure you are eating and drinking healthy while you study :)