Ôn thi đại học môn Toán học O is an Android application developed by Vinsofts Mobile Team that falls under the category of Education and Reference. The application is designed to help students who are preparing to take the national high school graduation exam in Vietnam. The app contains a summary of the 12th-grade math program, which is essential for students to have a comprehensive understanding of the subject matter.

In addition to the program summary, the app has several useful features, including an evaluation of the student's performance on the national exam, and a practice test section that contains math exams created by BaiTap123.com. The app also has a feature to remind students of upcoming tests and study schedules. This offline application is an excellent resource for students preparing for the national high school graduation exam in Vietnam.