The best way to see how good you are and improve in any subject (imo) is to answer exam questions. In this section, I have taken a topic from A level Chemistry, selected relevant past exam questions and walkthrough how to answer the question. Students who have used these in the past tell me they are far better than using mark schemes due to the fact that they often don't explain where the answer comes from. You can try each question first by clicking the link in the video description.Â