In IAS Prelims there are 2 papers of objective type questions. The 1st paper consists of questions from current affairs, General Science, Indian History, Economy, and related subjects, while the 2nd paper has questions from Comprehension, Logical Reasoning, Mental Ability, Data Interpretation, and decision-making problems.
The IAS Mains also consists of 9 papers of subjective type questions based on writing skills, language tests, essay writing, and general studies.
The Interview round of IAS is a personality and intelligence test.