In 2023, Kumon began automated takedowns of answer keys on file-sharing sites. Downloading a PDF from a random source is a common way to get malware or spyware on your computer.

Authenticity is critical. Using unofficial or crowd-sourced answers leads to errors because Kumon frequently updates its worksheets (from the original 1970s editions to the "New Edition" and "2nd Edition").

If you manage to obtain a legitimate answer key, follow these ethical guidelines to actually improve your English skills.