10 Common Theory Test Mistakes in Cambodia (And How to Fix Them)

By Testdrive KH team · February 2, 2026 · Updated June 10, 2026

theory-teststudy-guidemotorbike

Most learner drivers who fail Cambodia’s theory test don’t fail because they can’t drive - they fail because of a handful of avoidable, repeatable mistakes in how they prepare. Below are the 10 most common ones, based on the categories that trip people up most often, along with a specific fix for each.

Quick summary: the biggest theory test mistakes are memorizing answer positions instead of rules, under-preparing on road signs, skipping timed practice, ignoring motorbike-specific questions, not reviewing wrong answers, studying in only one language, confusing similar signs, underestimating right-of-way questions, skipping the license/documents section, and cramming the night before instead of practicing over several days.

1. Memorizing answer positions instead of understanding the rule

It’s tempting to memorize “question 7, answer C” - but the real test may rephrase questions, reorder answer choices, or use a different sign image entirely. If you’ve only memorized positions, a slightly reworded question can throw you off completely.

The fix: focus on the rule behind each question (e.g. “red circles mean prohibited,” “give way to traffic from the right at an unmarked intersection”). Once you understand the underlying rule, you can answer any variation of the question - not just the exact one you’ve seen before.

2. Treating road signs as a side topic

Road signs are one of the largest categories on the test, and unlike traffic law, the shape-and-color system is consistent and easy to learn quickly - which makes it one of the easiest places to lose points if you skip it.

The fix: spend dedicated time on signs specifically. Work through road sign flashcards until shapes and colors become automatic, then test yourself with the Road Signs category. For a refresher on the shape/color system itself, see our guide to understanding Cambodian road signs.

3. Skipping timed practice

The real exam is timed - typically around 20 minutes for 25 questions, or roughly 48 seconds per question. If you’ve only ever studied questions one at a time with no time pressure, the clock on exam day can cause careless mistakes you wouldn’t normally make.

The fix: take full mock exams with the timer running, ideally more than once, so the pace feels familiar before you sit the real test.

4. Ignoring motorbike-specific rules (even for a car license)

Even if you’re testing for a car license, some questions cover rules that apply specifically to motorbikes and scooters - which make up the majority of vehicles on Cambodian roads. Drivers who assume “that’s not my category” often lose easy points here.

The fix: don’t skip the Motorbike Rules category, regardless of which license you’re applying for. The rules overlap with general traffic law more than most people expect.

5. Moving on without reviewing your mistakes

Getting a question wrong once and immediately moving to the next one is a missed opportunity. Without reviewing why an answer was wrong, the same gap in knowledge tends to resurface on exam day.

The fix: after every practice session, go back over the questions you missed. Most good practice tools (including Cambodia Test Drive) show an explanation after each answer - read it, and revisit your weakest categories regularly rather than only doing fresh questions.

6. Studying in only one language

If you’re more comfortable in English or Khmer, but only ever practice in the other language, unfamiliar wording can slow you down or cause misreads on exam day - especially for traffic-law questions with precise terminology.

The fix: practice in the language you’ll actually be tested in, but also try switching languages occasionally. Seeing the same question in both English and Khmer can help you recognize key terms either way, which is useful if your testing center phrases things differently than you expect.

7. Mixing up similar-looking road signs

Several Cambodian road signs look alike at a glance but mean very different things - a red circle (prohibition) versus a yellow triangle (warning) versus a blue circle (mandatory). Mixing these up under exam pressure is one of the most common sign-related errors.

The fix: drill the shape/color system until it’s automatic, not just the individual signs. Once you can instantly sort a sign into “must not,” “be careful,” or “must do” by its shape and color alone, most sign questions become much easier - even for signs you haven’t seen before.

8. Underestimating right-of-way and intersection questions

Right-of-way rules - who gives way at an unmarked intersection, roundabouts, merging traffic - are conceptually simple but easy to get wrong under pressure, because the “obvious” answer isn’t always the legally correct one.

The fix: practice these questions specifically and read the explanations carefully each time. These rules also matter for real-world driving, so understanding them properly pays off well beyond the exam.

9. Not knowing the license and document requirements

The theory test isn’t only about driving behavior - it also covers what documents you’re required to carry, license categories, and related administrative rules. Drivers who focus entirely on “driving” questions often get caught out here.

The fix: make sure you’ve worked through the License & Documents category at least once during category practice, even though it can feel less interesting than road signs or traffic rules.

10. Cramming the night before instead of spacing out practice

Trying to cover the entire question bank in one long session the night before the test usually means everything blurs together, and weak categories don’t get the extra attention they need.

The fix: spread practice across several days, focusing each session on one or two categories. Use the category practice mode to target weak areas, then finish with one or two timed mock exams in the final days before your test.