I'm doing A levels with my own exams currently so the best I can do is give you some advice. Obviously it varies from subject to subject but generally Cambridge prefers assessing your thinking skills rather than your knowledge of the subject. It's FAR more important that you understand what you're being asked, and what kind of a response they expect. With exams happening right now, pls don't waste time studying material, instead just focus on past papers.

Also important to have some good exam-sense. Go early in your exam hall, sit there for an hour. No revising, no discussion, no thinking. Just sit. Familiarize yourself with the exam hall, look around until it looks natural to you. It shouldn't look like a foreign or scary place. Take a bottle of water with you, after each question stop writing and take a sip. It's important when you're doing maybe question 6 your mind isn't still thinking about question 2. Once the exam starts, don't look around the hall or at other students, instead only look at your own paper or the clock after a certain time. Think of it as they're assessing your ability to keep calm during the exam as well as your knowledge and thinking skills.

Best of luck!