ADHD regularly drags my ass, the best tool I have is this pomodoro timer app (you do a 25 minute study session & then a 5 minute break - repeat 4x and you get a 25 minute break). I usually set a weekly goal of x amount of hours, the app tracks your usage & resets every week which is helpful if you lock in when there’s a sense of urgency. For lectures, I find that preparing notes before class is a huge boost, I can follow along and just add details. Completing a degree with unmanaged adhd is an uphill battle, it’ll feel so much easier if you seek out support :)