UPSC IES/ ISS Exam 2021 Details. Union Public Service Commission (UPSC) given a notification to conduct Indian Economic Service (IES)/ Indian Statistical Service (ISS) Exam 2021. Posts : 26 Qualification : For IES: Candidates should possess Post-Graduate Degree in Economics/ Applied Economics/ Business Economics/ Econometrics from a University. For ISS: Candidates should possess Bachelors Degree/