Driving · Commercial
CDL School Bus (S) Endorsement Test
The knowledge test for the S endorsement: danger zones and mirror adjustment, loading and unloading students, emergency evacuation, railroad crossings, student management, ABS and special safety situations.
Questions last checked against the official sources on October 10, 2026.
The real exam at a glance
- Questions
- 20 (varies by state)
- To pass
- 80% (16 of 20)
- Time
- About 20 minutes (varies by state)
- Also needed
- P endorsement and a skills test in a school bus
- Based on
- Section 10 of your state's CDL manual
What you'll practise
Try a question
Why stop at least 10 feet from the waiting students?
- It makes them walk to the bus, so you can see their movements
- It saves fuel
- It lets traffic pass safely between them and the bus as it stops
- It keeps them from reading the bus number
Show the answer
A. It makes them walk to the bus, so you can see their movements — This forces the students to walk to the bus so you have a better view of their movements (CDL Manual 10.2.1)
Sample questions by topic (in English)
- Endorsement rules
- Danger zones and mirrors
- Approaching the stop
- Unloading
- Emergency exit and evacuation
- Railroad-highway crossings
- Student management
- Antilock brakes
- Special safety considerations
Ask the examiner
Ask about this exam: why an answer is wrong, a grammar point, or “quiz me on …”.
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Questions about the CDL School Bus
Is this the official CDL School Bus?
No. Semplr is independent and not affiliated with the exam body. We write every question ourselves, in the official format and at the official level.
What is the real CDL School Bus like?
Questions: 20 (varies by state). To pass: 80% (16 of 20). Time: About 20 minutes (varies by state). Also needed: P endorsement and a skills test in a school bus. Based on: Section 10 of your state's CDL manual.
How is my practice marked?
Instantly. You see your score against the pass mark, and an explanation for every question — including the ones you got right.
Can I take it on my phone?
Yes. The whole mock exam works on a phone, and your progress is saved in your browser.
Ready for a full run?
One sitting, real timing, then your score against the pass mark.
Start the free mock exam