PTT - 66 MCQ 25/50 ට වඩා වැඩි ළමුන්... | 🔴 2021 Chemistry - OSMAN JAYASINGHE...🎓

I'm a graduate of the University of Ruhuna,paper marking examiner-chemistry in Advanced Level examination since 2003 and also a government teacher.I have produced outstanding and unbeatable results in...