Vịt Đếm Ngược is a lifestyle app designed to help students prepare for the Vietnamese National High School Graduation ExamIt features a countdown timer displaying the days, hours, minutes, and seconds remaining until the exam. Users can update the exam date based on their grade levels (10th, 11th, or 12th) and access study materials for exam preparation. The app also includes a timetable function for inputting, viewing, and sharing schedules, as well as practice tests and a diary to record memorable moments during the final days of high school.

Moreover, Vịt Đếm Ngược offers inspirational quotes, well-wishes, and encouraging messages to motivate students. Additional features include a home screen widget for convenience, customizable app backgrounds, text colors, and fonts. Users can unwind with various entertaining games such as word puzzles, trivia quizzes, and horoscope readings, providing relaxation after intense study sessions.