This is the only legal way to get Kumon sheets. Most centers now have a hybrid model allowing you to print sheets from a secure parent portal (Kumon Connect) or receive physical booklets. You get the PDF functionality without the piracy.
Kumon is a franchised business, and its worksheets are proprietary intellectual property. Official Kumon centers do not typically distribute their worksheets as free PDFs online. Consequently, finding a legitimate, complete library of official Kumon worksheets for free is generally not possible—or legally gray at best. Most "official" sheets found on file-sharing sites are scanned copies uploaded by individuals, and their quality can vary significantly. kumon sheets pdf
Students begin at a "just-right" level where they can solve problems comfortably and accurately, building the confidence needed for more advanced material. What is Kumon? - Student Resources This is the only legal way to get Kumon sheets