Ontario Class D (DZ) overview
Ontario Class D (DZ) 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.
- 2 official
Free
Official guide
The Official MTO Truck Handbook (Ontario Ministry of Transportation)
Ontario Ministry of Transportation · Free online / print copy at DriveTest centres
The study guide for the Class A and Class D knowledge tests and road tests. Chapter 1 covers licensing, inspections, coupling and hours of service; chapter 2 covers driving and backing a combination; chapter 6 explains how the road test is scored. Every question on this site cites a page of it.
The Official Air Brake Handbook (Ontario Ministry of Transportation)
Ontario Ministry of Transportation · Free online
Needed for the Z endorsement that most DZ drivers also take. The truck handbook refers to it for air brake inspection and adjustment.