Civil Services Exam is conducted in three stages i.e. Preliminary, Mains followed by interview. The detailed notification is issued by UPSC in Employment News generally in November/ December every year. You may also access www.upsc.gov.in for the relevant information.

The optional that could be suitable to you could be Maths, Physics, management or any of the Social Sciences optional such as Anthropology depending on your aptitude and individual choice etc. The paper is generally of a standard that is slightly higher than the Graduation level. The detailed syllabus of each of the optional is available in the EN Notification or UPSC website. You may also contact any of the leading book sellers for a reference book that may contain such information.