UPSC IES Prelims 2021 exam is scheduled to be conducted on July 18, 2021. Candidates appearing for the Indian Engineering Services prelims exam can check the timetable released on the official website of UPSC, upsc.gov.in.UPSC IES Prelims 2021 exam will be conducted in two shifts. The first shift is scheduled from 10 am to 12 pm, and the second shift is scheduled from 2 pm to 5 pm. 2 to 3 lakh candidates have registered themselves to appear for the UPSC IES Prelims 2021 exams. The commission will conduct the written examination in 15 centres across the country.