The hardest CDL test section is the Airbrake test. The airbrake exam requires you to memorize a good portion of Section 5 in the DMV CDL Handbook.
Keep in mind that more than 75% of everyone that takes the Class A CDL exam without studying or preparation fail. That’s why you either need to invest in study materials or enroll in study classes.
There are three parts to the exam. The first is the written exam. Do not underestimate this part. Most people that have passed the exams will tell you not to attempt to guess on the questions or your own experience to know the answers. The Airbrake test is part of the written exam.
The second part of the exam is the pre-trip inspection. This tests your knowledge of vehicle inspections and tests that you understand when commercial vehicles are safe and unsafe to operate on the road. Thankfully, you can learn and follow the pre-trip inspection steps one way because they do not change.
The final part of the exam is the road and yard skills test. This tests your actual ability to operate the commercial vehicle. What exactly will be included in the test may vary slightly from state to state so make sure that you are fully aware of the regulations in the state you plan to get licensed in.
The part of the CDL exam that ends up being the most difficult for you may depend will likely depend on what you’re least prepared for. If you don’t prepare, your odds of passing the exam are very slim. It is highly recommended that you invest in study materials or take classes prior to taking the exam if you hope to pass the first time.