BEST Online Graphing Calculator I've seen yet: https://www.desmos.com/
Graph functions, plot tables of data, evaluate equations, explore transformations, and much more – for free! (and download the app for your IOS or Android device)
TI-83 Emulator App for the Android Phone: a number of my students have downloaded this and tell me it works well. Of course, you may not use your phone during quizzes and tests, but it's nice to have this app so you can practice using the graphing calculator which is sometimes needed on quizzes and tests.
TI-83/84 GRAPHING CALCULATOR TUTORIALS:
(useful for PC Math 11 & 12 students)
Finding x&y intercepts: https://www.youtube.com/watch?v=oDsQXQcTk5U
TI Calculator Tutorial: Finding Intercepts
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Finding the vertex (max/min): https://www.youtube.com/watch?v=6DjKubsBodE
Finding the Vertex/Maximum/Minimum of a Quadratic Function ...
In this video, I show how to use the TI83/84 to find the vertex (MAX/MIN) of a quadratic function.
Khan Academy TUTORIALS: a popular website with quality YouTube tutorials on just about any high school topic you could think of. The only downside is that it is American curriculum so you have to search by topic to find the specific skill you need help with.
Math Study Guides & Strategies: some really great tips for being successful on Math tests and exams
Math Contests: download math contests (and complete solutions) from previous years
Math Games: the famous "Tower of Hanoi" and other brain teasers (requires Java plugin)
Summer School Information: for students who need to improve their mark or for those who want to challenge a course by taking the entire curriculum in the summer