Web Resources
Here, you can find various resources to help you hone your math skills.
MathCounts
The official national MathCounts website.
Great for learning of the MathCounts program's breadth, history, and purpose.
But more importantly, it's rich with weekly-updated practice problems by MathCounts, for MathCounts. The site has been releasing a fresh problem every single week since September 2012 for students to tackle, and includes an archive of all previous problems.
Art of Problem Solving
Also known as AoPS, Art of Problem Solving is hailed the king of competitive math.
Hosts an incredible community of problem solving enthusiasts of all ages.
Hosts great video lessons on math topics.
A meeting ground for math resources of all kinds, namely the MATHCOUNTS Trainer and Alcumus.
Sells textbook The Art of Problem Solving, Volume 1 , which is strongly recommended to any MathCounts student who wants to get serious about competition.
Mathinee
High quality practice problems as well as lecture notes for MathCounts range topics.
Detailed descriptions of interesting topics you'd have trouble finding in school.
Track your progress on your own account as you indulge in over 200 weblessons.
Khan Academy
Nationally partnered learning site for many subjects (most notoriously math).
Video lectures and interactive practice problems, but with a pleasant design unmatched by other website learning tools.
(Be warned, this site will follow you into your high school years if you're planning on taking any AP classes!!)
Pleasanton Math Circle
Another Pleasanton math group.
Gives biweekly lectures on various topics in math.