Hmm... my suggestion would be to do 1-2 (depending on ADHD "allowance" and energy) small tasks a day and to make sure you celebrate accomplishing the tasks. When we reward ourselves - even for the "small things" - our brain takes notice and begins to want that celebration/reward for completing even the smallest of tasks. Eventually, you'll be able to tackle larger tasks as time goes on. Just be sure to reward yourself, even if you only finish part of a task. That reward could even just be telling yourself, "Good job, me, for getting that done!" Make sure, if you decide to tackle a larger task, you're done "borrowing energy" that you need for later or the following day. (I highly recommend checking out the Spoon Theory, if you haven't already!)

I don’t know if this is something you’ve already done, but I work in the ADA office at my college, and there are accommodations and lots of other resources available to students with ADHD, mental illness, and other disabilities and challenges. I personally work as a peer coach for students with accommodations, and I help them with time management, scheduling, accessing resources, and so on. I’d encourage you to see what type of support is available at your college.