Copy screenshots of the questions you got wrong into a separate document or a slide deck (Google Slides or PowerPoint). Review this "Error Bank" every weekend.
The is the personal trainer. It forces you to actively produce grammar, not just passively recognize it. The digital format adds portability, searchability, and reusability that a physical book cannot match. Tobira Grammar Power Pdf
Don't print the whole 200 pages. Print only the grammar points you struggle with (e.g., keigo or conditionals). Put them in a binder. Because you have the PDF, you can re-print the same chapter a month later to test your retention. Copy screenshots of the questions you got wrong
Each of the 15 chapters aligns with the main textbook, providing drills for specific grammar points. Foundation Building: Tobira Grammar Power Pdf