The difference between a B and an A* in International A Level Chemistry often comes down to . Examiners love to provide "unseen" molecules or unfamiliar experimental setups to see if you can apply your knowledge to new contexts.
Units 3 and 6 (the alternative to practicals) are often what separate an A from an A*. You aren't just tested on the result of an experiment, but on uncertainties, safety precautions, and color changes --- Pearson Edexcel International A Level Chemistry Student
Getting through the Pearson Edexcel International A Level Chemistry The difference between a B and an A*
The Pearson Edexcel International A Level Chemistry qualification is a two-year course that covers a broad range of topics in chemistry, including: but on uncertainties
