Step to apply for UPSC ESE 2018 :
Application fee :
Candidates need to pay Rs 200. (excepting female/SC/ST/ PH who are exempted from payment of fee)
Age limit :
A candidate must be not less than 21 years and must not have attained the age of 30 years on August 1, 2018.
Selection process :
Those candidates who qualify the preliminary round will have to appear for the main exam, dates of which will be released later. Those who clear the main exam will then be called for the interview round.
About Union Public Service Commission (UPSC) :
The Union Public Service Commission 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 exams for the recruitment in various departments of the state.
Source: http://indiatoday.intoday.in/education/