Requirements for preparation materials: 1. Completed registration form; 2 qualification certificates and other application materials; 3. Vocational qualification certificate; 4. My relevant certification materials; 5. Academic certificate; 6. Business qualification certificate, etc.
Yes, there are questions and papers from previous years for reference every year. You can download them from official website, the exam of Chongqing Water Supply Company, or you can search the relevant collected materials for understanding.