Ôn Thi THPT Quốc Gia is a free educational app developed by KL Studio for Android devices. The app is designed to help high school students prepare for the National High School Graduation Exam in Vietnam. It offers a comprehensive collection of practice tests and official multiple-choice exams from 2018 to 2021, covering all subjects required by the Ministry of Education and Training.

The app is user-friendly and can be used offline, without an internet connection. It includes detailed solutions for each question, and new tests are continuously updated. The app covers a wide range of subjects, including Mathematics, Physics, Chemistry, English, Biology, History, Geography, and Civic Education. Students can use the app to quickly grasp different question formats, review theoretical knowledge, and gain valuable experience for the official exam.