Every semester I would work 9-5, take classes from 6-10, go home, fall asleep, rinse and repeat. I had no time to study, but when I did, I often did other things because I had no energy or motivation. I did this for four years (and I already had 2 years of college prior to this!). It was exhausting.
My only suggestion would be to take a light workload and aim to master the subject. I breezed through most of my classes because I already knew the material. For tougher subjects (e.g. statistics, compilers) I struggled. The material wasn't that hard, but because I didn't take it too seriously at the start (when it was easy) I fell behind due to weak understanding of core concepts. Never fall into that trap. Commit to studying consistently, seriously, and keeping at pace with the class.
I only did this because I wanted a degree. I think it's a piece of trash, but I wanted a little bit of security in life (I was in my early 20s and just getting started). Since you want to learn for learning's sake, commit to that. Don't try and cut corners.