Many "completers" share tips and walkthroughs on platforms like Reddit (r/Kumon) or Discord. While full PDFs are rare due to copyright, these communities are great for asking for help on specific, difficult pages (like O 160 or O 200).
Most instructors allow Level O students to grade their own work at the center using the physical binder. kumon+math+level+o+solution+book
Problems involving volume of solids of revolution, arc length, and surface area. Many "completers" share tips and walkthroughs on platforms