On Luyen is a test prep and practice app designed for Vietnamese high school students. It covers all subjects including Maths, Physics, Chemistry, English, Biology, History, Geography, and Civic Education. The app is suitable for all students regardless of their academic level.

The self-pacing practices in the app provide one practice for each learning unit and students can take as much time as they need to finish each unit. The question bank consists of over 120,000 items with detailed instructions, theory flashcards, and video lectures for each question. The questions are listed by difficulty level.

The testing feature in the app helps students prepare better for 45-minute exams, end term exams, and national high school exams. There are thousands of automatically created tests that adhere to the standard national curriculum. The app also provides a list of previous tests from gifted schools all over Vietnam. Detailed instructions and reports are available for each test paper.

On Luyen also includes supporting functions such as bookmarking interesting/hard questions for future reference, raising doubts and receiving answers for any test item, and detailed reports to help students track their progress.

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