Master the DET with PrepEx.
Take a full-length PrepEx DET practice test or train one task at a time. Get objective results, detailed speaking and writing feedback, saved reports, and a clear next step from Petra.
Ten full-length practice tests for a complete run.
Each test takes about 60 minutes and moves through 35 timed tasks across all 13 DET task families. PrepEx uses its own difficulty routing for Reading and Listening, then saves a 10–160 practice estimate and detailed report.
Every completed test includes
- Speaking and writing feedback tied to your responses
- Overall, individual, and integrated practice estimates
- A saved report with task-level review
- Targeted recommendations for what to practice next
All ten full-length tests require DET Pro. DET Pro plans start at $9.99 for 7 days and renew until canceled. See what each full test includes.
PrepEx practice estimates are not official DET scores. Difficulty routing uses an internal PrepEx practice model, not Duolingo's operational adaptive or scoring system.
All four skills in one place
Work through the 13 task families currently available in the PrepEx DET hub. Grammar and vocabulary support appears inside feedback and recommendations.
Speaking
Record timed answers and see how content, organization, fluency, grammar, vocabulary, and pronunciation shaped your result.
- Speak About the Photo
- Read, Then Speak
- Interactive Speaking
- Speaking Sample
Writing
Write under realistic time limits and get response-specific feedback on content, coherence, grammar, and vocabulary.
- Write About the Photo
- Interactive Writing
- Writing Sample
- Detailed revision priorities
Reading
Build word recognition and passage comprehension with deterministic grading and immediate answer review.
- Read and Select
- Fill in the Blanks
- Read and Complete
- Interactive Reading
Listening
Train accurate processing, spelling, and conversational comprehension with audio-dependent tasks and objective review.
- Listen and Type
- Interactive Listening
- Conversation response practice
- Task-specific percentage results
Practice, get feedback, improve
Pick a skill
Choose Reading, Listening, Writing, or Speaking, then open the task type you want to train.
Complete the task
Answer under DET-style timing with the same focused workflow used throughout the practice hub.
Use the feedback
Review the evidence behind your result, then follow Petra's recommendation for the next practice session.
See what shaped your practice estimate
Writing and Speaking feedback breaks the response into clear criteria. Reading and Listening show task-specific percentages. PrepEx results are practice estimates, not official DET scores.
Speaking practice estimate
Illustrative speaking practice report
Writing practice estimate
Illustrative writing practice report
DET-style practice built to test real English
PrepEx creates independent practice from public DET format and construct documentation, then reviews the language, media, answer keys, and learner interaction before publication.
Current Reading, Listening, Writing, and Speaking task formats are represented across the practice experience.
Speaking and Writing guidance stays tied to the learner's answer and the prompt instead of returning generic advice.
Objective answer keys and private grading context stay server-side until the learner submits a response.
Advised by language experts
Industry leaders guide PrepEx's development across TOEFL, IELTS, PTE, CELPIP, and DET.
2 free graded DET sessions every day
Browse the practice hub for free and submit two graded sessions per day across all four skills. Free results include your saved response, rubric scores, and a concise focus plan. DET Pro removes the daily cap and adds criterion-by-criterion evidence, complete history, dashboard patterns, and recommendations.
DET Pro plans start at $9.99 for 7 days. DET Pro is a separate, recurring subscription from other PrepEx exam products. Cancel anytime.
PrepEx is a member of the Duolingo English Test Global Partner Network. Our practice content, feedback, and score estimates are independently created by PrepEx and are not official DET materials, scores, or results. Duolingo English Test is a trademark of Duolingo, Inc.