DET Practice is a cutting-edge AI solution tailored for individuals preparing for the Duolingo English Test (DET). The platform simulates the actual test environment with a comprehensive suite of practice materials covering all four language skills: reading, writing, speaking, and listening. Through advanced algorithms, the system provides immediate, detailed feedback on performance, highlighting specific areas such as grammatical accuracy, lexical range, pronunciation clarity, and response coherence. Users benefit from adaptive learning paths that adjust to their proficiency level, ensuring targeted skill development. The platform includes full-length mock tests that mirror the DET format, along with specialized exercises focusing on common challenges. Progress dashboards visualize improvement trends and identify persistent weaknesses, while strategic guides offer test-taking techniques. Accessible via web and mobile interfaces, DET Practice supports flexible learning schedules with offline capabilities. Its multilingual support system assists non-native English speakers in navigating the platform. By combining AI-powered analysis with pedagogical expertise, DET Practice delivers a holistic preparation experience that builds both language competence and test-taking confidence.