I love the website KhanAcademy.org, and I'm continually recommending it to my students.
I'd like to do a matching of their topics to Ontario curriculum. It's a rather big job, which I'll probably never get around to doing in full.
However, here's one to start. To review probability and cover the material in permutations and combinations in Grade 12 Data Management (fondly known as MDM4U), start with this link:
Follow the topics on the left-hand side. Part of what I love about the site? Notice the "Stuck? Watch a video!" on the right-hand lower corner. It's on every question!