Instructions :
The qualified candidate seeking admission to the Civil Services (Main) Examination must apply online through the website and upload the scanned copies of the required document within the prescribed time limit so that Detailed Application Form (DAF) is submitted by the applicant on time.
Exam centres :
Ahmedabad, Aizawl, Allahabad, Bangaluru, Bhopal,Chandigarh, Chennai, Cuttack, Dehradun, Delhi, Dispur (Guwahati), Hyderabad, Jaipur, Jammu, Kolkata, Lucknow, Mumbai, Patna, Raipur, Ranchi, Shillong, Shimla, Thiruvananthapuram and Vijayawada.
About Union Public Service Commission (UPSC) :
The Union Public Service Commission (UPSC) is an organisation that works under the central government to recruit staff for various posts in the various ministries and departments, and in subordinate offices. The commission also conducts examinations for the recruitment in various departments of the state.
Source: http://indiatoday.intoday.in/education/