Prepare the Certificate of Service – A Certificate of Service is a document that confirms you served a certain document. On each page, write in the page number and the total.It helps if you fill in the top part of the form with the case and court information. Form Interrogatories are a list of questions on a court form. Fill out the Proof of Service form following the instructions below, except for the signature at the bottom. Make two copies of the filled out Proof of Service. The California Code of Civil Procedure provides very clear and concise guidelines to attorneys or paralegals who are drafting special interrogatories. Each interrogatory must be answered separately and fully in writing under oath. The answers must include such information as is available to the party served. You must serve all pleadings in the manner prescribed in the Court Rules, including a proof of service.