01. Perfect reflection of the latest Duolingo English Tests
The latest textbook that fully analyzes and reflects recent Duolingo English Tests

02. From basic study tips to practice tests, all in one volume!
Complete analysis of 10 question types, strategies and study tips, and exercises for all difficulty levels (Level 1~3)

03. Clear all your doubts about DET!
Provides all information from test registration to test preparation, the testing process itself, and the rules that will keep you from being invalidated

04. Around 1000 vocabulary words from real past exams!
Carefully selected vocabulary words related to the answer keys that appeared in the real DET exam

05. Free audio provided!
Audio recorded by native-speaking professional voice actors (MP3 download or QR listening)

[부록]
1. Writing Sample