What is the hierarchy of Civil Services?

hierarchy of civil services
if IRS is the 4th in civil service hierarchy and IAS at ist place, then which services are at 2nd and 3rd place?

Related UPSC Questions:

• Differences between central civil services and state civil services? Is the syllabus same for both?
• I am a B.Tech (CSE) graduate. Suggest me the best optional subject set for Civil Services Exam.
• Should I go for Science or Humanity in class 11th to crack Civil Services exam in future?
• What is the difference between district collector and district magistrate?
• Are civil engineers eligible for civil services?
• What are the required qualifications for Civil Services? Can I do preparation for Civil Services after completing graduation B.Com with 49%?
• Best coaching classes for IAS in Maharashtra especially Pune? What is the pattern of IAS exams? How to prepare for same?
• Can we appear in state civil services exams in more than one state? When the exams are scheduled in 2013?
• What is the right attitude and strategy towards UPSC Civil Services Exam? Are Civil Services only topper's choice?
• Which exam should I write between CDS (Common Defence Services) exam and CSE (Civil Services Examination) after B.Tech? What is the scope of CDS/CSE? Can I start preparing for this kind of exams from 8th semester of B.tech?

Civil services exam is conducted by UPSC(Union Public Service Commission)

this exam held once in a year

Hierarchy Of CSAT exam is

There are three stage

prelim exam
main exam
interview

prelim exam are the basic exam which is held in the month of may in every year.
mains exam are the exam on 2nd stage only those candidate can give this exam who clear prelim exam in that year.
next and last stage is interview stage. for interview only those candidate are eligible who clear the above two stage in that year.