You could do one as an audiobook while you do something else like cleaning or mindless video games or art, and the other physical reading!
Or sometimes I will read a physical book IRL, then crawl into bed at night and switch to another book digitally, lol. For some reason having them in different formats helps me keep them apart and feel like a different activity
I figured out how much I needed to read each day for my assigned reading to get it done on time. I always read what I had to for the assigned reading first, but once I reached my daily quota I could read whatever I wanted without stress.
Don't know if that would work for you or not, but I know it worked well for me.
Ok-Spray2 t1_j9j041m wrote
Do your mandatory readings, since they are mandatory. Organize your time to finish that task like any other task you have to do.
Then read your pleasure books in your free time, and do it as you want since you don't need to meet any deadline. Don't overthink it.
TLDR: Focus on finishing your obligatory task. The rest should flow naturally depending on your interests.