1. The problem is to identify the most repeated questions and answers from the CHSC board for 5 marks. 2. Since this is a request for repeated questions and answers, it is not a mathematical problem but rather a study or exam preparation query. 3. As an AI math tutor, I can help with math problems but cannot provide specific repeated questions from a board exam. 4. If you have a specific math question or problem from the CHSC board, please provide it, and I will help solve it step-by-step.