Google Calendar (or any other calendar solution!)
Enter deadlines on your calendar. Schedule blocks of time that you will dedicate to working on your coursework.
Back in the day, the Flylady taught me that I could do anything for 15 minutes. Set a timer for 15 minutes and get to work. Then do something else for 15 minutes. And so on and so forth. These days, I see references to the pomodoro technique — work in 25 minute increments, take a short break between each, and after four sessions, take a longer break. There are numerous apps that can automate the timing. If I find one I really like, I’ll share it here.