TL;DR – What You Need to Know
- Typical prep time: 1-4 weeks, depending on your starting level and target score
- Best free resource: Duolingo’s own free practice test and Official Guide at englishtest.duolingo.com
- Biggest score gains come from: using the full time limit on every speaking/writing task, not from cramming vocabulary lists
- Most students underprepare for: Production and Conversation subscores, not Literacy or Comprehension
- The test rewards proficiency, not test tricks: cramming the night before won’t move your score much; consistent English practice over 1-4 weeks will
Table of Contents
- How long should you actually prepare?
- Understand the format before you study anything else
- The one-week study plan
- The one-month study plan
- Free official resources worth using
- Section-by-section preparation tips
- Test-day logistics and setup
- Common preparation mistakes
- Frequently asked questions
- Next steps
How long should you actually prepare?
There’s no universal answer, and Duolingo itself is upfront about this: the test is designed to reflect your real proficiency level, not to be “beaten” through cramming. Intense last-minute studying won’t move your score much on its own. What does help is consistent practice with the test’s specific format and time pressure over a sustained window.
As a general guide, most students spend somewhere between one and eight weeks preparing, depending on their starting level and target score:
- Already comfortable in academic English, just unfamiliar with the format: 1 week is often enough
- Solid English but need to sharpen speed and fluency under time pressure: 2-4 weeks
- Building English proficiency more broadly, not just test familiarity: 4-8 weeks, sometimes longer
If your deadline is genuinely close, focus your limited time on format familiarity and pacing rather than trying to build general proficiency from scratch; that’s a longer project than a test-prep window can realistically cover.
Understand the format before you study anything else
The single highest-value thing you can do before any content review is understand exactly how the test works, since its format differs meaningfully from IELTS, TOEFL, or PTE.
It’s computer-adaptive. Question difficulty adjusts in real time based on your performance. Answer well, and the next question gets harder; struggle, and it eases off. There’s no fixed number of questions: the test ends once the grading engine is confident in your score estimate.
It’s a single continuous section, not separate blocks. Unlike IELTS or TOEFL, DET doesn’t split Reading, Writing, Listening, and Speaking into distinct timed sections. Question types appear in a mixed, randomised order across the roughly 45-minute graded portion.
There’s an unscored portion too. After the adaptive section, you complete a video interview and writing sample. These aren’t scored by the AI engine, but universities receive the recording and writing sample alongside your score, and admissions staff do sometimes review them, particularly at more selective institutions.
Total time is about an hour, including setup (ID verification, secondary camera check) and the unscored interview/writing portion at the end.
Spend your first study session just watching an official walkthrough video and taking Duolingo’s free practice test, before you do any targeted skill practice. Familiarity with the format alone removes a lot of avoidable, first-attempt score loss.
The one-week study plan
If your deadline is close, concentrate on format familiarity, pacing, and your weakest subscore rather than trying to cover everything evenly.
Days 1-2: Format and diagnostic. Take the official free practice test. Watch a walkthrough video of the full test experience. Identify which of the four subscores (Literacy, Comprehension, Conversation, Production) feels weakest based on your practice test estimate.
Days 3-4: Targeted practice on your weakest area. If Production is weak, spend these two days almost entirely on timed speaking and writing prompts, recording yourself and reviewing critically. If Comprehension is weak, focus on listening to natural-speed English content and reading academic passages under time pressure.
Day 5: Full mixed practice. Work through a mix of every question type so no format catches you off guard, rather than over-indexing on just your weak area by this point.
Day 6: One full-length, timed mock test in test-day conditions. Quiet room, webcam on, one uninterrupted hour, no pausing.
Day 7: Light review only. Skim your notes, watch one more walkthrough if it helps your confidence, and rest. Avoid cramming new material the day before; it doesn’t meaningfully move an adaptive proficiency score and can add unhelpful pre-test stress.
The one-month study plan
With more runway, you can build genuine proficiency gains rather than just format familiarity.
Week 1: Diagnostic and foundation. Take the free practice test, identify your weakest subscore(s), and establish a daily practice habit: some reading, some listening, some speaking, some writing, every day, even briefly.
Week 2: Subscore-focused deep work. Dedicate most sessions to your two weakest subscores specifically. If Literacy is weak, read academic-level English daily and practise timed written responses. If Conversation is weak, have real back-and-forth exchanges with another English speaker rather than only rehearsing monologues.
Week 3: Full-format integration. Start working through mixed practice sets covering every question type, not just your weak areas, so the full adaptive flow feels familiar. Take at least one full-length timed practice test this week.
Week 4: Simulation and polish. Take one or two more full-length practice tests under strict test-day conditions. Review your recorded speaking responses critically for fluency and clarity. Confirm your technical setup (webcam, secondary camera, quiet space) well before test day, not the morning of.
Free official resources worth using
You don’t need paid courses to prepare well. Duolingo provides substantial free material directly:
- The free practice test at englishtest.duolingo.com, available 24/7, as many times as you like, giving an unofficial score estimate (note: it’s shorter than the real test, so treat the estimate as directional rather than precise)
- The Official Guide for Test Takers, covering every question type, scoring criteria, and sample responses with analysis of what score range they’d fit
- The DET Handbook, a comprehensive PDF covering strategies and practice exercises for each question type, with an answer key
- Duolingo’s official YouTube channel, with walkthrough videos and test-taking tips
- The Duolingo Blog, with practical suggestions for practising English in everyday life, not just test-specific drilling
Work through the official free practice test multiple times over your preparation window, not just once at the start, since your comfort with pacing and question variety improves noticeably with repetition.
Section-by-section preparation tips
Reading and vocabulary tasks (Literacy). Read varied English content daily, ideally academic-level articles, not just casual content. Practise sentence-completion exercises focusing on grammar patterns like verb tense, prepositions, and subject-verb agreement, since several DET question types test rapid grammatical recognition under time pressure.
Listening tasks (Comprehension). Practise with natural-speed English audio, podcasts, lectures, or interviews, ideally without subtitles. A common cause of low Comprehension scores isn’t a vocabulary gap, it’s processing speed under real test conditions.
Speaking tasks (Conversation and Production). These are where students most often underprepare, and where the biggest score gains are typically available. Record yourself answering timed prompts on common topics (daily routine, a memorable experience, describing a photo) and listen back critically for pace, clarity, and completeness. Crucially: use the full time limit given. If you’re given 30-90 seconds to speak, aim for closer to 90; a shorter, incomplete-feeling response scores lower than one that fully uses the available window, even if the shorter one has fewer errors.
Writing tasks (Literacy and Production). Practise writing complete, fluent responses rather than padded ones. DET rewards concise, well-structured writing over long-winded responses; students who write slowly or over-hedge their sentences often score below their actual ability level.
Interactive Speaking (a 2026 addition). This task simulates a real conversation, where the topic can shift midway and you can’t replay the audio prompt. Practising real back-and-forth exchanges, rather than rehearsed monologues, is the most direct preparation for this specific task type.
Test-day logistics and setup
Getting the logistics right removes a whole category of avoidable problems that have nothing to do with your English ability:
- Choose a quiet, private, well-lit room where you won’t be interrupted for a full uninterrupted hour
- Have a government-issued ID ready for identity verification before the test starts
- Set up your secondary camera (a phone or tablet, fully charged, propped at the correct angle to show your desk and surroundings) – this is a standard requirement, and many test invalidations happen because the secondary device slipped or ran out of battery mid-test
- Test your primary computer’s camera, speakers, and microphone in advance, not for the first time during the official tech check
- Purchase your test in advance so all you need to do on test day is log in and click “Start”
- Pick a time of day when you’re mentally sharpest, whether that’s early morning or later at night; DET is available 24/7, so there’s no reason to test at a suboptimal hour
- Stay looking at the screen throughout, since the test is proctored and looking away repeatedly, even innocently while thinking, can trigger a flag
Common preparation mistakes
1. Cramming grammar rules and vocabulary lists instead of practising the actual task types. DET tests how you use English under real-time pressure, not isolated grammar knowledge. Students who focus preparation on the wrong thing often score lower than expected, not because their English is weak, but because they trained the wrong skill.
2. Under-using the time limit on speaking and writing tasks. A response that stops well short of the allowed time, even if grammatically clean, typically scores lower than one that fully uses the available window with a broader range of vocabulary and structure.
3. Only rehearsing monologues, not real conversation. The Interactive Speaking task specifically rewards natural, responsive back-and-forth, which monologue practice alone doesn’t build.
4. Skipping the free official practice test. It’s free, available anytime, and the single best way to reduce first-attempt surprises about pacing and format.
5. Treating practice test scores as an exact predictor. Practice test estimates are directional, not precise, particularly since the free version is shorter than the real test. Don’t over-index on a single practice score, good or bad.
6. Neglecting technical setup until test day. Secondary camera issues, unreliable internet, or an untested microphone are avoidable problems that have derailed otherwise well-prepared test-takers.
7. Not addressing your specific weak subscore. Generic “improve my English” studying is less efficient than targeting the specific subscore (Literacy, Comprehension, Conversation, or Production) that’s actually holding your composite score back. See our DET score guide for a full breakdown of what each subscore measures.
Frequently asked questions
Anywhere from one week to two months, depending on your starting level and target score. Most students find one to four weeks of focused preparation sufficient if they’re already reasonably comfortable in English and mainly need format familiarity.
Duolingo’s own free practice test and Official Guide for Test Takers, both available directly at englishtest.duolingo.com. These closely mirror the real test’s format and question types.
Not meaningfully. DET is designed to reflect your actual proficiency level, so intense last-minute studying has limited impact. Consistent practice over one to four weeks produces far better results than cramming.
Production and Conversation, the speaking- and fluency-heavy areas. Many students focus preparation time on vocabulary and grammar (which feeds Literacy and Comprehension) while under-practising timed, spontaneous speaking.
Yes. A response that stops well short of the allowed time typically scores lower than one that fully uses the window, since a fuller response demonstrates a broader range of vocabulary, structure, and fluency.
Yes, this is now a standard requirement: a phone or tablet propped to show your desk and surroundings, in addition to your primary computer camera.
It’s a useful directional estimate but not a precise predictor, particularly because the free version is shorter than the official one-hour test. Treat it as a general indicator of your current level, not an exact forecast.
Light review only. Confirm your technical setup, rest, and avoid cramming new material. The test measures your standing proficiency, not what you crammed the night before
It rewards genuine conversational practice rather than rehearsed answers, since the topic can shift midway and you can’t replay the audio prompt. Practising real back-and-forth conversation is more useful preparation for this task than memorising monologues.
Identify which specific subscore is dragging your composite score down and dedicate focused practice time to that area specifically, rather than studying everything evenly. See our DET score guide for what each subscore measures and typical requirement ranges
Next steps
Feeling ready to book? Save on the test fee with a discounted Comet voucher, delivered to your inbox in under a minute. Not sure what score to target yet? Check our DET score guide for requirements by university tier.
