උසස පළ රසයන වදයව - AL is a free Android mobile application that provides complete subject coverage for Sinhala medium students. Developed by H.M.S.M.Karunanayaka, the app is designed to help students prepare for their O/L exams.

The app has an extensive collection of questions and answers for all subjects, providing students with a comprehensive study guide. The app's easy-to-use interface makes it simple for students to navigate and find the information they need. The app also includes a feature that allows students to track their progress and identify areas where they need to improve.

Overall, උසස පළ රසයන වදයව - AL is an excellent resource for Sinhala medium students who are looking to excel in their studies. With its comprehensive coverage of all subjects and easy-to-use interface, this app is a must-have for any student preparing for their O/L exams.