Duolingo English Test prep built for the adaptive test.
PrepEx has helped TOEFL students practice with Petra, instant feedback, and skill-specific score reports. We are bringing the same practice loop to the Duolingo English Test: short mixed tasks, speaking and writing production, listening and reading drills, and DET score-scale feedback.
PrepEx is not affiliated with Duolingo. Duolingo English Test is a trademark of Duolingo, Inc.
Sample DET score profile
Short tasks, clear feedback, steady repetition.
DET rewards fast, accurate communication across mixed skills. The first PrepEx DET practice hub focuses on the task families that benefit most from repetition and feedback: speaking production, writing production, dictation, vocabulary, and integrated comprehension.
Speaking
Practice photo description, read-then-speak, interactive speaking, and speaking sample style prompts.
- Timed recording flow
- Pronunciation and fluency notes
- Answer structure coaching
Writing
Build concise written answers for production tasks where clarity matters more than length.
- Writing sample practice
- Grammar and vocabulary feedback
- Response completeness checks
Listening
Train the audio tasks that require quick processing, accurate spelling, and strong memory.
- Listen and type drills
- Listen and select practice
- Review after each attempt
Reading
Practice word recognition, sentence completion, and integrated reading tasks with instant review.
- Read and select tasks
- Fill in the blanks
- Interactive reading prep
DET practice on proven building blocks.
PrepEx started with TOEFL, then expanded to IELTS, PTE, and CELPIP. DET will use the same foundation where it helps students most: authenticated practice, AI grading, score reports, progress tracking, and Petra coaching.
PrepEx's TOEFL platform is used by thousands of students for timed practice, AI feedback, and section-by-section improvement.
Feedback will use DET score-scale language and skill categories instead of TOEFL scores or IELTS bands.
DET practice will not force everything into traditional sections. The hub can support short tasks and integrated skill practice.
Students trust PrepEx for real score gains.
DET is new on PrepEx, but the platform behind it already helps students improve with AI grading, Petra coaching, and focused practice.
Student testimonials submitted via email
"I went from 81 to 106 in two months. The AI grading pointed out things I didn't even realize I was doing wrong. Petra helped me stop memorizing and just sound more natural."
"I think what helped most was just being able to practice as much as I needed. After a while I could see the same mistakes coming up less, and I went into test day a lot calmer."
"Speaking was the section I dreaded most. I kept freezing at the start of my answers, so doing that many practice questions was what finally made it feel normal."
Advised by language experts
Industry leaders guiding PrepEx's development across TOEFL, IELTS, PTE, CELPIP, and DET.
Start with the DET practice hub.
The first DET practice hub now supports starter content, progress tracking, objective grading, and saved writing or speaking responses. Tell us which DET score target you are working toward as the library expands.
DET billing and AI scoring remain disabled while the starter library and task players expand.