How Many Questions Are on the Idaho CDL General Knowledge Test?

The federal government owns the question count and the 80% threshold — that part never changes state to state. What Idaho controls independently is the price tag around it: a $40 application fee, a $29 CLP fee, a comparatively cheap $3 charge per written test attempt, and a $70 skills test fee once you're ready for the road portion.

Additional written tests for endorsements like Air Brakes or Combination Vehicles run $3 apiece as well, so stacking several endorsement tests in one visit is genuinely inexpensive relative to the skills test itself.

An Idaho CLP stays valid for a full 12 months from issuance, noticeably longer than the 6-month window some neighboring states set, which gives an applicant real room to complete entry-level driver training and line up a skills test appointment without feeling rushed.

Federal rule still requires holding the CLP at least 14 days before that skills test can happen, regardless of how much of the one-year window remains unused.

Our practice tests break results down by topic immediately, so a weak spot doesn't stay hidden inside an otherwise decent overall score.

Each question includes an explanation and a source reference, so you learn why an answer is correct instead of just memorizing a letter.