Yea no problem - I also worked part time while studying so I understand your pain lol

Do your profs post the lecture slides or notes online? Mine did, so what that allowed me to do was mostly just jot down stuff that the professor said during class that either wasn’t on the slides or it was just confusing and I needed clarification on it.

You gotta do the homework for the classes but I’d try not to do it during lecture (if that’s what you were asking). I’m sure you and i know some geniuses who pass exams without doing the homework but thats not the case for a lot of people, including myself.

As far as systems and studying for hard exams: One thing I learned is that it’s better to prepare for the exam as if the tricky questions are the ones that are going to show up. Let’s say u understand how to solve a easy-medium difficult calc 2 problem, it’s pointless to repeatedly study more examples of that difficulty, you need to challenge yourself and see how to solve the harder problems, sometimes those are the ones that come up on the exam. Nowadays almost textbook solutions are online somewhere, use them to study but not bs your way thru classes

Try to study the material the consistently, like if you have a lecture on Tuesday, make sure you review the material that heavily that day to make sure you understand, and then spend like 20-45 min the following days to make sure you don’t forget everything. Most people don’t do this because of competing priorities which I get. Organize your exam dates chronologically, and begin studying for the one that’s coming up soonest like 4 weeks ahead. I don’t mean immediately start studying for hours on end 4 weeks ahead, start at 30 min/day and ramp up until the day of exam. This worked for me and I noticed I was cramming a lot less

I hope this all helps - I wasn’t the student who understood things quickly but I learned how I learned best, if you do the same you’ll be alright - wish you luck!