@hong.ting.chemistry: How to use these notes? Due to its high information density, I dont suggest skimming through it as the importance is in the details. I suggest geniuenly sitting down with your school notes and the SEAB syllabus open, zoom into each page, read each concept carefully and make mental links to what you have learnt in your school notes. Realise what you didnt know you didnt know. Realise what you have understood previously and reinforce those concepts. Realise the big picture of Organic Chem can actually be so simple. If you found this useful, check out my page for daily Chem strategies, and DM me to join my Chemistry O Level classes and achieve clarity and confidence before O Levels.