DET
DET Pro plans from $14.99
12 full-length tests · 13 task families

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.

Write About a Photo View Full Mock Tests
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Speaking estimate
125 / 160
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Included with DET Pro

Twelve full-length practice tests for a complete run.

Each test takes about 60 minutes and moves through 44 timed response units 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.

12full-length tests
44timed tasks each
13task families
~60minutes per test

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
View Full Mock Tests Try Free Task Practice

All twelve full-length tests require DET Pro. DET Pro plans start at $14.99 for 7 days and renew until canceled. See what each full test includes.

Complete DET Practice

All four skills in one place

Practice all 13 task families, with feedback and guidance to help you improve.

Speaking

Record timed answers and get focused feedback on fluency, pronunciation, and how you express your ideas.

  • Speak About the Photo
  • Read, Then Speak
  • Interactive Speaking
  • Speaking Sample

Writing

Develop clear answers under timed conditions, with detailed feedback and revision priorities.

  • Write About the Photo
  • Interactive Writing
  • Writing Sample

Reading

Build word recognition and comprehension, then review your answers after each task.

  • Read and Select
  • Fill in the Blanks
  • Read and Complete
  • Interactive Reading

Listening

Practice dictation and conversations, with clear results and answer review after each task.

  • Listen and Type
  • Interactive Listening
How It Works

Practice, get feedback, improve

1

Pick a skill

Choose Reading, Listening, Writing, or Speaking, then open the task type you want to train.

2

Complete the task

Answer under DET-style timing with the same focused workflow used throughout the practice hub.

3

Use the feedback

Review the evidence behind your result, then follow Petra's recommendation for the next practice session.

AI-Powered Feedback

Know what to improve next

Get detailed feedback on Speaking and Writing, and clear results for Reading and Listening.

Speaking

125 / 160

Practice estimate

Content and relevance82%
Organization and coherence79%
Fluency76%
Pronunciation74%

Sample feedback report

Writing

130 / 160

Practice estimate

Content84%
Organization and coherence82%
Grammar79%
Vocabulary85%

Sample feedback report

Practice Quality

Practice with confidence

Original DET-style tasks, reviewed before they reach you.

13 task families

Practice Reading, Listening, Writing, and Speaking in one place.

Feedback for your response

Speaking and Writing guidance is tied to your answer and the task.

Carefully reviewed tasks

Language, media, and answer keys are checked before each task is published.

Expert Guidance

Advised by language experts

Industry leaders guide PrepEx's development across TOEFL, IELTS, PTE, CELPIP, and DET.

Michael Goodine
Michael Goodine
TOEFL Resources
Zhao-Hui Xu
Zhao-Hui Xu
Bilingual Education
Bharad Raghavan
Bharad Raghavan
Stanford, Zoox AI
Jessica Jiang
Jessica Jiang
Columbia, Taft School
Meet our advisors
Start free today

2 free sessions.
A clearer next step.

Get rubric scores and a short focus plan after each DET session. Use that feedback to make your next attempt more focused.

Your next focus

Make the action easier to picture.

Use a precise action and details from the photo.

Three people sit around an open notebook and a laptop at a table.
A first attempt

“People are sitting at a table.”

With more detail

“Three people review an open notebook beside a laptop.”

Illustrative feedback · Write About the Photo · 60-second task
Try Write About the Photo View DET Pro Plans
Two graded sessions daily
All four skills
Saved responses + focus plans

Want to practice more? DET Pro adds unlimited graded sessions, deeper feedback, and complete history.

DET Pro plans start at $14.99 for 7 days. DET Pro is a separate, recurring subscription from other PrepEx exam products. Cancel anytime.