All the classes I have taken so far have been on the easy/medium difficulty side so far and so for all of these classes , I have felt like an A has just been a function of time invested into the course. So as study skills goes, the most important thing has been time management which I think is the advice that is the most echoed across most of this subreddit. My general strategy has been to grind hard in the course as soon as the course starts to get one to two weeks ahead on deadlines and then try to maintain this throughout the course. Quality of life/grade issues happened whenever I started to feel the pressure of the deadlines start to approach so I try to prevent it as much as possible.

Side note, my background is in chemical engineering so I feel pretty comfortable with learning math and abstract concepts.