Here is the official hotline of the Civil Service Commission (CSC). You can contact them for any inquiries including a guide on how to get to the nearest branch office.
You may opt in to come to the different CSC offices and respective branches. Search their website at csc.gov.ph to find serving areas.
You may call at telephone numbers: 951-2575 / 951-2576 / Hotline: 932-0111