Toronto District School Board says it is planning a quadmester model for the 2021-22 school year for secondary students.In a letter sent to parents and teachers on Wednesday, the TDSB said the model “allows us to best support students and maintain the necessary health and safety practices” amid the COVID-19 pandemic.The TDSB said based on direction from the Ministry of Education, timetables for high school students will be: COVID-19 vaccination for Ontario children will not be compulsory, health minister says However, the TDSB said adult day schools will remain on the same schedule as 2020-21 school year.“We will need to remain flexible and nimble and responsive to the direction provided by the Ministry of Education and Toronto Public.