I use Habitica and Forest. I try to gamify everything. Also rewarding myself for staying on track with 10 to 30 minutes of video games. I find I like audiobooks and podcasts to be in the background when I’m studying. I also use the Calm app a lot when I’m working. I like the city and coffee shop soundscapes. I’ve listed to This American Life Cars 129 about 50 times while doing my literature review. I am working full time, my wife and I have a new baby and I am also getting my doctorate. Another key strategy is waking up early like 5 AM to do a self-care routine to start the day. I meditate and exercise as part of my Habitica habits. It helps me get focused and feel ready for the day. I never took any medication growing up although the doctor recommended it. My parents made me meditate every day for 30 minutes when I got home from school and on weekends. I was basically grounded until I did that. It helped a lot for me. Those are some of my strategies.
It is a real test and they had an independent auditor but it still may be BS. Check out this Too Good To Be True article.