Mississauga and Toronto have a number of great private and independent elementary and high schools. Have a look at this map of private schools in Mississauga. Zoom in on the map to view the locations of each school. A few that are closest to Eglinton Avenue west include Mississauga Christian French School and Sommerville Manor School.
If continuing the IB curriculum is important to you, here is a list of IB Schools. Maple Crest Private School in Mississauga offers the IB program.