A great book on this topic, especially if you're still in university is "How to be a straight A student" by Cal Newport (https://www.amazon.com/How-Become-Straight-Student-Unconvent...)

Ignore the title for now and read through it, I believe there are excellent tips in note taking and how to process the notes to really excel in your studies.

If you're already working you have to adapt that system into something that works for you best, some use a bullet journal or audio notes and process them differently.

One really interesting approach (that I wasn't able to implement yet in full form) is to take creative notes (called sketchnotes). This works well if you're a visual person.

A great book on this would be The Sketchnote Handbook by Mike Rohde.

The article was brief and had some good advice, and it sets the issue straight of having priority of school over other activities. School is a full-time job and spending 40 hours/week should be expected. A lot of the advice are also just common sense.

I also strongly recommend Cal Newport's book "How to Become a Straight-A Student" (https://www.amazon.com/How-Become-Straight-Student-Unconvent...). I've read a lot of books on studying in college, but I think this one really is one of the best way to study.