Is your driver license expiring soon? Renew your license online!
Limited in-person appointments available. Learn more.
Apply for a first-time instruction permit online.
We're now offering appointments in some of our offices for:
The knowledge test is available in 4 languages (interpreters aren't allowed):
You can take the knowledge test at any driver licensing office location that offers testing. The test fee covers 1 attempt at each knowledge test taken within 90 days of the receipt.
You must pass the knowledge test and get a commercial license permit (CLP):
You're required to take the knowledge test any time you:
Knowledge test scores are valid for:
Knowledge test | Total questions | Passing score | Skills test needed |
---|---|---|---|
CDL general knowledge (A, B, & C) | 50 | 40 | Yes |
CDL combination (A) | 20 | 16 | Yes |
Passenger | 20 | 16 | Yes |
Air brakes | 25 | 20 | Yes |
School bus | 20 | 16 | Yes |
Double/triple | 20 | 16 | No |
Tank vehicle | 20 | 16 | No, unless you're taking your skills test or training in a commercial tank vehicle, then you must take the knowledge test before we can issue your CLP. |
Hazardous materials | 30 | 24 | No |
Call us: 360.902.3900 (TTY: Call 711)