IES ISS Mains is conducted by Union Public Service Commission (UPSC). It is a Offline (Pen & Paper) for descriptive papers; objective ISS Statistics papers per official scheme exam consisting of 80 questions for 200 marks with a duration of 120 minutes.
There is a negative marking of 0.33 per wrong answer. The minimum qualifying score is Varies by cut-off.
| Section | Questions | Weightage |
|---|---|---|
| Statistics-I (Objective) | 80 | 100% |
| Total | 80 | 100% |
