UPSC has already started that new date for the Preliminary Exam are to be declared on 20th of May. The present lockdown 4.0 can shift the dates further more.
“The situation will be reviewed again on May 20, 2020 and fresh dates for these examinations shall be notified on the UPSC website in due course,” commission notification on 4th of May.
List of Sundays from 14 June to 15 August
14, 21, 28 of June
5, 12, 19, 26 of July
2, 9 of August
However, the preparation should continue irrespective of the delays.