From Monday, 28 June 2021, Primary 4 to 6, Secondary 3 to 5 an | New Age Parents

From Monday, 28 June 2021, Primary 4 to 6, Secondary 3 to 5 and all JC/MI students will return to school.
Secondary 1 and 2 students will be on Home-Based Learning (HBL) till Wednesday, 30 June 2021, and will return to school from Thursday, 1 July 2021.
Primary 1 to 3 students will be on HBL for the first week, and schools will continue to provide instructions and support for students to access online and hardcopy HBL materials.

https://thenewageparents.com/moe-school-holidays-2021-singapore/