The best PDFs are scanned so that Solution Page 42 corresponds exactly to Worksheet Page 42 in the student’s set.
While not a PDF, channels like "Kumon Sensei" or "Math with Mr. J" often work through entire Level L sets on video. This is arguably better than a static PDF because you hear the reasoning.
LibGen occasionally hosts older Kumon solution books. Search for "Kumon Level L Solution Manual." The quality varies (often "okay," not "top").
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