I just worked out a way of handling university that took my GPA from 2.1 to 4.0. Can I summarize it for you? If it can help you, great, and if you can tell me how to do it better, also great!
1- leisure time. I try to enforce 4 hrs of leisure time a day plus an entire day off on weekends that is specifically kept free. I think that of all of it, keeping spare time every day has saved me from burnout! Even a hint of burnout throughout the week begins to erode my productivity when I am working. Apparently, long hours trains you to resist burnout though- but it takes years. The Korean school system anyone?
2- starting slow, building up to 50hrs/wk schoolwork. Began with do 1hr of work in 3hr slot, etc. More and I tend to burnout hard- hence, (1) above. Work towards the full workload. The idea is to make early failures impossible.
3- prioritization. About 10% of the possible work pays off enough to get 100% on most tests and assignments. Figuring out what that 10% was and hitting that hard. Specifically, using active recall to review every lecture the day after, and doing problem sets that target my specific failure points. I think that's one major reason why Kespa players can get so good, right? They don't just ladder, they grab their training bitch and/or teammates and iron out every single kink in a focused way.
4- margin of error/identify failure points: make sure that there's a lot of room to move with the system so it won't collapse. Figure out all the common reasons why things go wrong and address them directly.
5- reflection and big-picture focus once a week on Sundays. This is for life and for school!
6- condensing: condense everything I learned into a 1 page summary per subject or something every sunday. This helps with memory, and with the big picture focus.
7- exercise and a morning/evening ritual that focuses on good food with no white carbs. High intensity > duration, imo so far. I find that by avoiding carbs my concentration is unreal too... you said your easily distracted. Look into the research for avoiding wheat and carbs in ADHD lately. I can't stress how big this is, you could never understand unless you were in my shoes
I assume you have your own thoughts too! I'm eager to see you tear it up in some upcoming tournaments!