2023 Edition Proficiency Test Questions and Explanations Proficiency test for those taking the police officer and firefighter exams (for university graduates), with answer key and explanations. Received as unwanted items from a move. I did not use them myself. Please purchase only if you understand that these are home-stored, used items, and have been inspected by a non-professional. Also, please be sure to read my profile to prevent any trouble. Thank you for looking.