Need to split up grammar points even more.
Example:
Separate formal and polite into separate review items. Separate different forms of grammar points into different review items if the form is different (typically following na adjectives).
When I learn one grammar point, it’s extremely difficult to recall all 4 forms at the same time. But once I master one form, it becomes much easier to learn the next form, the form after that, and the final form. This is the equivalent to starting to ride a bicycle on gear 6 instead just starting on gear 1 and accelerating your way to gear 6.