Ontario Private Investigator study guide and books

Start with the free official guide — it is what the test is written from. Books only help if you want printed practice or a structured course.

Free

Official guide

Private investigator study guide (Ontario Ministry of the Solicitor General)
Ontario Ministry of the Solicitor General · Free online
The ministry's own test preparation guide. It follows the eight sections of the training syllabus, states the test format and the 77 percent cut score, and links to the laws it relies on. Every question on this site cites one of its sections or a law it points to.
Guide de préparation à l'examen pour enquêteurs privés (version française)
Ministère du Solliciteur général de l'Ontario · Gratuit en ligne
Official French edition of the study guide, for candidates who prefer to prepare in French.
Training syllabus for private investigators
Ontario Ministry of the Solicitor General · Free online
The curriculum every approved basic training course must follow: eight sections and at least 50 in-class hours, with the minimum requirements for each section. Use it as a checklist of what the test can draw on.
Private Security and Investigative Services Act, 2005 and Code of Conduct regulation
Government of Ontario (e-Laws) · Free online
The Act that licenses private investigators. Sections 2, 9, 10, 34 to 40 and 45, plus the one-page Code of Conduct regulation (O. Reg. 363/07), are the parts the study guide asks you to know.