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Support: support@richieprep.com — account, access, and test-player questions. We aim to reply within one business day.

Content and errata: errata@richieprep.com — report a suspected answer-key or explanation issue. Every report is triaged against the exact content version you saw.

Privacy: privacy@richieprep.com — data questions and deletion requests.

Accessibility: access@richieprep.com.

By phone: +82-70-8080-3301. The full business details of Richie’s Educational Research Institute are at the foot of every page.