Why randomizing what you study can actually help
Studying one subject in a long, uninterrupted block feels productive, but research on 'interleaved practice' suggests mixing between topics can improve long-term retention compared to studying one thing at a time. A study topic wheel makes it easy to enforce that mixing without having to manually track what you've covered.
It also removes the low-level decision fatigue of picking what to study next every time you sit down — list everything you need to cover, and let the spin decide the order.