All 350,000 pupils in Northern Ireland returned to school on Monday, April 12.
For many of those in post-primary years eight to 11, it will be their first time in the classroom in 2021.
Primary and pre-school pupils and those in years 12-14 made a phased return to school in March before the Easter break.
Health Minister Robin Swann and Education Minister Peter Weir welcomed the return, but said safety measures should continue to be followed.
The full return to school follows a decision taken by the Northern Ireland Executive on 1 April.
The Public Health Agency (PHA) has said that is to reduce the risk of the virus being transmitted in schools.
Post-primary pupils will also be required to wear face coverings in classrooms unless they have an exemption.
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