របមនិតលីហតទ៩-១២: Math 9-12 is a free educational app developed by Khmer1jivit for Android users. The app is designed to help students in grades 9-12 study math in a comprehensive way. The app includes a wide range of features such as summarized notes, video tutorials, and quizzes to help students learn math in an interactive and easy-to-understand way.

The app has several sections, including summarized notes, videos, and quizzes that cover a wide range of math topics such as algebra, geometry, trigonometry, and calculus. The summarized notes section contains concise and easy-to-understand notes on various math topics. The video tutorial section provides step-by-step guidance on how to solve complex math problems. The quiz section includes multiple-choice questions to help students test their knowledge and understanding of various math topics.