Mr Koh is a good teacher. Without his help, I would not have been able to get an A for Chem 1. He shows concern for our learning. If we have doubts, we can stay back after class to ask him. We can also have free consultations with him outside class to ask him any questions. He also gives free refreshments so we can stay attentive through the lessons. (esp if we had come for tuition straight after school) 2. He teaches well. Mr Koh conducts his lessons in a way that is well structured and easy to understand, especially topics on acid-base equilibrium and organic chem. The practices given are exam -oriented. 3. His notes (in booklets) are the best in my opinion. As compared to lengthy lecture notes from school, the booklets are well condensed and structured. E.g. His organic chem booklet presents clearly,in a mindmap form, the relationships of one chapter to another. All the best Mr Koh and god bless.