If you're looking for a resource that offers full test simulations and unlimited practice questions for the Duolingo English Test, EduX could be a good option. EduX uses AI technology like GPT-4 and Whisper AI to offer full-length practice tests, instant scoring and feedback, and unlimited practice questions. It covers all areas of the test, including Listen and Type, Read Aloud, and Speak About the Photo, so it's a good tool to help you prepare and improve your English language skills.
Another good option is Quizlet, which offers a range of tools, including practice quizzes and written-answer questions. It's not specifically geared for the Duolingo English Test, but its large community of users and study modes like Spaced Repetition can help you prepare for the test by optimizing your study time.
Last, Loora offers one-on-one, real-time conversations to help you improve fluency and confidence. It offers real-life conversation simulations and instant feedback on pronunciation, grammar and accent, so it's a good option if you want to improve your English for career advancement or personal development.