I'm a little bit of a perfectionist. In high school, my personal motto was "A is Average" - I sometimes dedicate an unhealthy amount of time to it.

A big thing that helps is having a defined schedule and task sorting. Every assignment got placed onto the big "master calendar" I hung next to my home desk. Every test date, assignment due date, review session was logged there. As each was completed, I marked it off.

I also carried a smaller notepad with a list of everything from the master calendar. So when a professor assigned something new, or I had to see someone, pick something up, I'd jot it down in the notepad with a due date. Each morning I'd "sync" the master calendar and notepad, and make sure everything was up to date.

I also had a morning checklist pinned to my wall of everything I needed in my pockets, I'd set out the textbooks and binders I need for the next day the night before, as well as clothes.

Above all in my first semester, I placed my physical health. Every morning was the same breakfast, tracked with myfitnesspal, tracked each lunch and dinner, and made sure to do a body weight fitness routine I developed every other day. The exercise has the additional mental health benefit of relieving stress. I also have a grip strength clamp in my desk for when I don't get a grade I want on a quiz or test; like a hardcore stress ball.

This is what I do, I'm very organized. I'm sure there are others out there, smarter than I, who would have needed to dedicate less time to the 8 classes I had; but it took a lot of effort this semester. I drove myself into depression and became incredibly envious of my friend's social life. I really didn't have one; and I still feel incredibly lonely not having truly met a single girl this semester.

Sorry for the rant.

TL;DR: Discipline in steps, don't expect it over night. Get organized, set expectations, and remember to get exercise and for the love of God have a social life!