Classroom bubbles to minimize contacts for students in kindergarten to Grade 8: N.B. gov For students in kindergarten to Grade 2, the group size will be reduced to as close to 15 as possible, grades 3 to 5 will have groupings close to 22 students and grades 6 to 8 will have regular class sizes.The idea is that classroom bubbles would allow students to interact with other students and staff without physical distancing.