Taking an English proficiency test from the comfort of home is one of the biggest advantages of the Duolingo English Test (DET)—but it also means that test takers are responsible for ensuring their test environment meets all security requirements. Every day, our human proctors review test sessions to confirm that all rules have been followed. But mistakes happen, and sometimes, test takers unintentionally break a rule that results in their test being invalidated.
We want to help you avoid that frustration! Here are the top five most broken DET rules, why people often break them, and what you can do to make sure your test session is successful. You've got this!
1. Looking away from the screen 👀
Why this rule exists
The DET is designed to assess your own English ability—without outside help. If a test taker frequently looks away from the screen, proctors cannot verify whether they are reading from notes, looking at another device, or receiving help from someone off-camera.
Why test takers break this rule
Many people naturally glance around when they’re thinking, especially in a high-pressure situation like an exam. Others may be distracted by movement in their testing space, or instinctively check the time or look at something off-screen. Of course, you may need to look at your keyboard from time to time as you're typing! But don't worry—looking at the keyboard to type will not affect the certification decision for your test.
How to avoid breaking this rule
- Keep your eyes on the screen at all times—even when thinking through a response.
- Choose a distraction-free space so you won’t be tempted to look away.
- Do not look at any other resources during the exam.
- If you feel the need to pause and think, do so while still looking at the test screen.
2. Incorrectly setting up the camera 📷
Why this rule exists
The DET requires a second camera, usually a smartphone, to ensure test integrity by providing a complete view of your testing environment. If the secondary camera is not positioned correctly, it could create blind spots that prevent proctors from verifying test security.
Why test takers break this rule
Many test takers are unfamiliar with how to properly position their secondary camera or don’t realize that it must continuously record the testing area. Others may have technical issues, such as the camera disconnecting during the test.
How to avoid breaking this rule
- Follow the setup instructions carefully—your phone’s camera should capture both your computer screen and keyboard.
- Check your camera placement before starting to ensure a clear, unobstructed view.
- Set your phone to Do Not Disturb Mode if possible (some older phones do not have this setting).
- Do not move or touch your phone once the test begins.
3. Receiving assistance during the exam 👥
Why this rule exists:
The DET is a solo test—no one else can assist you in answering questions. Whether it’s another person speaking to you, writing notes for you, or guiding you in any way, receiving assistance immediately invalidates your test.
Why test takers break this rule:
Sometimes, family members or roommates accidentally enter the testing room to ask a question. Other times, well-meaning friends or family try to “help” by clarifying an exam question. Even whispering or speaking in another language can be flagged as assistance.
How to avoid breaking this rule:
- Let everyone in your home know you are taking an important exam and cannot be interrupted.
- Lock the door, if possible, or place a sign outside your room to prevent accidental intrusions.
- If someone does enter unexpectedly, ask them to leave immediately without speaking.
4. Copying responses from another source 📝
Why this rule exists:
Your writing responses must be your own original work, created in real time during the test. Copying responses from study materials, online sources, or previous exams defeats the purpose of assessing your authentic English skills.
Why test takers break this rule:
Many test takers prepare by memorizing answers to common test questions, thinking this will help them during the test. Others mistakenly believe they can use notes or pre-written text as long as they don’t copy-paste directly.
How to avoid breaking this rule:
- Write your responses from scratch—don’t use memorized or pre-prepared answers.
- Trust your skills! The DET is designed to assess real-world English ability, so writing naturally is your best approach.
- If you prepare for the test, practice forming responses in your own words rather than memorizing scripted ones.
5. Running external software 💻
Why this rule exists:
The DET strictly prohibits other programs from running in the background during your test. This rule prevents unauthorized assistance, screen recording, or any software that could compromise test security.
Why test takers break this rule:
Many people aren’t aware that certain apps run in the background automatically (like messaging services or video conferencing tools). Others forget to close work-related software or accidentally trigger a notification or pop-up during the test.
How to avoid breaking this rule:
- Before starting, close all programs except the DET desktop app.
- Check for apps that auto-launch, like WhatsApp, Grammarly, Zoom, or Slack, and disable them temporarily.
- Restart your computer before your test to ensure no background programs interfere.
Follow the rules, test with confidence
Breaking a rule—intentionally or not—can lead to your test being invalidated, delaying your plans for university admission or visa applications. But don’t stress! If you understand and follow the rules, you’ll have nothing to worry about.
Here’s how to get ready for a smooth test experience:
✔️ Review the test rules ahead of time—visit our Readiness Guide.
✔️ Take a practice test to get comfortable with the format. The DET practice test is free, unlimited, and available on desktop or mobile!
✔️ Set up your testing environment properly—quiet room, good lighting, and no interruptions.
✔️ Test with confidence! If you follow the rules, you’re set up for success.
For more guidance, check out our YouTube channel, or read our full test rules. Happy testing!