From today, all remaining primary school children are set to return to school full-time with all secondary pupils returning on a part-time basis, meaning they will continue to do some learning at home until after the Easter break.
The Scottish Government has said the move is ‘vital’ for children’s well-being.
However, the decision came under fire from a senior teaching union figure on Sunday.
Assistant secretary of the EIS teaching union Andrea Bradley claimed the decision was "politically motivated" as the Scottish Government needed a "good news story" amid the Alex Salmond saga.
Education Secretary John Swinney said the Government's "sole motivation" was ensuring pupils' well-being.
Children in primaries 4-7 are due to join their younger classmates who were the first to go back to school on February 22.
Senior secondary school pupils required to attend for practical work for qualifications were able to return from the same date.
Secondary school pupils are required to observe two-metre social distancing in school and on school transport as well as wearing face coverings.
Nicola Sturgeon confirmed the plans in a speech to MSPs on March 2 and has repeatedly stressed that having pupils return to school is her lockdown easing priority.
She previously defended the partial return for secondary school pupils, despite being told some youngsters could spend less than two hours a week in the classroom.
The First Minister told MSPs: "We decided to try, even if it was limited, in the period between now and Easter to get young people back into school for some periods and to reacquaint them ahead of the Easter holidays.
"We are trying to get back to the provision of full-time education as quickly as is possible, and to recognise the need to introduce, even if it is partial, and even if it is phased, and even if it is limited, greater degrees of normality for young people from now onwards."
Despite the return, exams have been cancelled for the second year in a row.
An independent commission on school reform has called for a full-scale public review on how pupil performance will be judged in the future.