Proof-based questions in A-Level Mathematics often require a different approach than problem-solving questions. They test your understanding of theorems, definitions, and logical reasoning. Here are some strategies to tackle them effectively:

 1. Understand the Question

- Read Carefully: Understand what the question is asking for. Identify the main theorem or concept that needs to be proven.

- Identify Given Information: Note down any given conditions or statements that can be used to start your proof.

 2. Plan Your Proof

- Outline the Structure: Before starting the proof, outline the logical structure of your argument. This can help you stay organized and ensure that your proof is coherent.

- Identify Key Steps: Break down the proof into key steps or sub-proofs. This can make the proof more manageable and help you focus on one part at a time.

 3. Start with What You Know

- Use Given Information: Start your proof by using the given information. This can often be used as a starting point or a base case.

- Use Definitions and Theorems: Use definitions and theorems that you have learned to build your proof. Make sure to clearly state any definitions or theorems you are using.

 4. Use Logical Reasoning

- Logical Steps: Make sure that each step in your proof logically follows from the previous step. Avoid making unjustified leaps or assuming what you are trying to prove.

- Use Proofs of Known Results: If you can't immediately see how to prove something, try using proofs of known results. This can help you build up to the proof you are trying to find.

 5. Be Clear and Concise

- Write Clearly: Write your proof in a clear and concise manner. Use proper mathematical notation and logical symbols where appropriate.

- Avoid Redundancy: Avoid repeating the same argument or using unnecessary steps. Be clear about your reasoning and avoid unnecessary details.

 6. Review and Revise

- Check for Errors: Review your proof for any errors or mistakes. Make sure that each step is justified and that the proof is logically sound.

- Revise if Necessary: If you find any errors, revise your proof accordingly. Make sure to clearly explain any changes you make.

 7. Practice Regularly

- Practice Proofs: The best way to improve your proof-writing skills is to practice regularly. Try solving different types of proof-based questions to build your confidence and familiarity with the process.

- Seek Feedback: If possible, get feedback on your proofs from a teacher or tutor. This can help you identify any areas for improvement and learn from your mistakes.

By following these strategies and practicing regularly, you can improve your ability to tackle proof-based questions in A-Level Mathematics effectively. Remember to stay patient and persistent, as proof-writing is a skill that takes time and practice to master.