If you are looking for a PDF or physical copy, prioritize editions published by (available at retailers like Amazon or The Lawbook Exchange), as they often include the superior 1809 Hall translation and modern notes.
Go to AbeBooks, eBay, or ThriftBooks. Search for "Clerk Exam Study Guide 2023" or "Civil Service Clerical Battery." Because these exams don't change drastically year-to-year, buying a 2023 edition in 2024 is safe and costs ~$10. clerks praxis book pdf better