DET guides

Clear answers for the Duolingo English Test

Find practical, source-backed answers about DET fees, format, scoring, preparation, and test-day rules.

Getting started

What is the Duolingo English Test?

Start here for the 2026 DET price, test length, format, scoring, result timing, and score validity.

Grammar and vocabulary

Use 18 examples to fix recurring errors in articles, tense, word forms, sentence boundaries, and dictation.

Study planning

Diagnose weak tasks, review errors precisely, and choose a 7-, 14-, or 30-day plan for your deadline.

Test-day rules

Check your computer, phone angle, room, input settings, gaze, and appeal options before the test begins.