TORONTO Some parents and students are raising concerns about a voluntary school-based COVID-19 testing clinic in York Region that brought families from four different schools into the gym at Stouffville District Secondary School Thursday. “I made a huge mistake,” mom Julie Stevens said, who brought her nine and 12-year-olds boys for the testing. “I shouldn’t have taken my kids in.” Officials with York Region sent letters to Stouffville District Secondary School, Oscar Peterson Public School, Wendat Village Public School, and St. Brigid Catholic Elementary School indicating students and their immediate family members and staff could receive a COVID-19 test with limited wait times. There were 45 minute intervals created between each school.