Grade 1 and up, this is the place to go with all your questions about dealing with older children, how to find interesting activities for Summer Programs and Before & After school care, and much more.
Jobs in a school board for students are pretty slim. ECE's can work in the school board as Educational Assistants and in Sept in ON in the JK/SK classrooms. However, the competition for these spots will be fierce. You would likely need your diploma to get in. Now if this school has a before/after school program within it, there are opportunities for ECE students there. I worked in one for many years before I got in a daycare centre. Students can apply for Ministry Approval to hold qualified positions or work as assistants while they complete their degree.
Good luck!